Before I was a Christian, I was very interested by New Age type spirituality - myths, neo-shamanism, neo-paganism and the like. But I was also on 'the right' politically - or so I supposed - being a sort of conservative/ libertarian.
I was recurrently amazed that everybody in the New Age movement was on the Left, often very far on the Left - and even mildly Right-ish people (such as Republicans or Conservative) were extremely unusual.
But New Age ideas, if they were taken seriously, often seemed to imply, if not a Right wing political world, then at least certainly not the mainstream Left wing politics of our era.
Yet the New Age writers and gurus were mad keen on the actuality of modern mainstream Left wing politics - and would on the one hand sometimes endorse the specific political leadership of the West, when they were members of Leftist parties - but certainly would never endorse any Right wing political figures - would express utter disgust about them.
However, going back just a few decades, some of the originators of New Age spirituality has been 'of the Right'. For example, Joseph Campbell (the mythologist) was a Republican. And Fritz (Small is Beautiful) Schumacher ended his life as a strongly Thomistic, distributist Roman Catholic - with a radically reactionary vision of the good society.
The New Age legacy of these men (and others) was almost uniformly Leftist - The Joseph Campbell Society and the Schumacher Society/ College both exuding the absolutely characteristic behaviours and concerns of the modern Left, and excluding and Right wing ideas.
Going back further than a few decades, there was a strongly National Socialist element in New Age ideas - with neo-Paganism a significant part of the early Nazi movement on the one hand, and the ideas of CG Jung (the major New age theorist) on the other.
And back in the mid-1980s, Andrew Dobson wrote an interesting book called Green Economics in which he (rather boldly and honestly) suggested that if Green ideas were taken seriously, Fascist organization was one of the logical directions they could take. And this would, I think, apply to New Age spirituality as well.
IF they were taken seriously.
The simple reason for the Leftism of New Age (and the Green movement) is that the ideas are not taken seriously, the beliefs are very weakly held - therefore, New Age ideas do not provide people with a fundamental motivation for their lives - and this can be observed empirically by the fact that the actual behavior of New Agers conforms to the dominant Leftist ideology even where this contradict New Age ideals (which is, actually, in most places).
In sum, New Agers are fundamentally Leftist and only superficially dedicated to New Age spirituality.
New Agers (and Green politics in general) is uniformly Leftist for the simple reason it is motivationally weak; therefore, adherents believe in Leftism more powerfully and deeply than they believe in New Age; therefore, whenever there is a conflict, Leftism wins - and wins easily, with barely any sense of a conflict.
New Age is merely a set of superficial therapeutic lifestyle ideas and entertainments and diversions - the movement is spiritually just too weak to do any serious work in the modern world.
And that is why it is Leftist. The writers, performers, artists, gurus of the New Age are Leftists first and firmly; and spiritual only when and where it fits in with Leftism.
Note: Exactly the same argument applied to Liberal Christianity. The reason why Liberals are all Leftists is because their Christianity is so weak - they do not feel sufficiently motivated by their supposed Christian beliefs - in fact their 'Christianity' is far too weak ever to win against the Leftism which is their true primary motivation.