Leftism (conceived as a long-term Satanic plan directed against God, divine creation and The Good; and aiming at - pretty much - exactly where the world is now) was originally defined by its opposition to Christianity.
More subtly it was framed as anti-'clericalism' directed at the 'abuses' (real or imputed) of whatever specific church was dominant in some place.
But when Leftism began to become more strategic; and began its highly successful efforts to infiltrate, subvert, invert and (now) substantially co-opt Christianity - it started to advocate (apparently) Christian-compatible 'single-issue' doctrines such as the abolition of slavery and pacifism.
Both apparently emanated from Nonconformist Protestants in Britain, especially the Quakers - who included many wealthy and successful businessmen (and who were, moreover, probably the best employers of their day - i.e. providing the best remuneration, housing and conditions for their workers).
Leaving aside abolition; pacifism has remained a constant and strongly supported ideology ever since - and it re-emerges whenever there are a significant section of The Establishment who oppose a particular war; or as now when the entire Establishment takes one side in a war.
But since The Establishment certainly are Not pacifists (are, indeed, exactly the opposite!) - pacifism takes the more subtle form of 'Peace-ifism'; with concerted demands for 'peace' from the right hand - accompanied by left-hand actions that directly aim to maximize innocent civilian casualties.
In practice, peace-ifism is always one-sided.
It means that the side disapproved-of should give-up, surrender, retreat - and face whatever punishment The Establishment choose to inflict upon them.
(And especially their leaders; who can expect to be scapegoated and punished severely up to and including execution - whether judicially or by mob.)
Peace-ifism is not, therefore, about peace!
Under the New Leftism of perpetual revolution - peace is not on-offer from our Global Establishment; but instead perpetual-revolution.
From the Establishment we get multiple sources of violence as excuses for ever more repression, monitoring and control; all being positively-propagandized, organized, funded, encouraged and legally-allowed.
Anti-peaceful riots and lootings, destruction, violence - operating with impunity under whatever Leftist banner is currently being deployed: birdemic-peck, antiracism, climate emergency, compulsory mass immigration/ refugee crisis... Whatever.
Thus, peace-ifism shares the soft-and-cuddly, wouldn't-harm-a-fly vibe, feel-good/ virtue-signaling attributes of pacifism; yet is in practice (and by intent) also integral-to and accompanied-by (deniable but deliberate) encouragement of severe physical punishment, violence and killing.
In other words; peace-ifism is just-another morally-corrupting manipulation of the masses by The Establishment.
And when all The Establishment institutions (which includes the major Western Christian churches) are united in propagating peace-ifism; and when this evil manipulation (with its obviously evil provenance!) is blotted-up and regurgitated by our docile, cowardly, unthinking and uncritical masses - as currently...
Well, it makes for a profoundly unedifying spectacle!
Another way of conceptualizing peace-ifism is that it is net-evil - evil overall - because it is intrinsically dishonest, deceptive and manipulative.
Peace-ifism pretends to neutrality ("all we want is peace!) yet always and necessarily it takes one of the sides - and yet denies the fact.
There is no neutrality in peace-ifism: firstly because there is no such thing as neutrality; and secondly because when you analyze any specific case you will find this to be so.
I have recently been studying the American Civil War; which was a horrible and destructive business - and if ever there was a candidate for peace-ifism, surely this was one of the strongest?
Yet there was no neutral way of imposing peace - one side or the other was bound to be the loser. If we assume that the South wanted to retain its agrarian life based on slavery; then this was not possible so long as the USA remained unified.
For slavery to continue, the abolitionist North would need to enforce slavery laws (such as capturing and returning escaped slaves) and thereby be complicit in a practice they found abhorrent - and the North would lose.
Yet if slavery was to be abolished, the South would lose their way of life (as actually happened when they lost).
The obvious solution - that the South separate from the North, was exactly what the North would not allow - and this was indeed the original cause of the war.
Yet the South was smaller, poorer, and much less industrialized - so if the South did not separate, then the South would lose (as actually happened).
In sum, there could be no peace without losers; so peace-ifism was just taking one side or the other - but pretending not to by calling vaguely for 'peace'.
As then, so now: All calls for peace, when made concrete and implemented, are always a matter of taking sides.
To take sides but dishonestly pretend to neutrality, is intrinsically sinful.
And if you really cannot decide which side is the less-evil (a discernment that is nowadays made easy by noticing the provenance of propaganda) then you should neither have nor express any opinion.