The monomaniac used to be a type of person who had but one thing he regarded as important, who related every other matter to that one thing, who subordinated every matter to that one thing.
Such an attitude is intrinsically sinful and such a person is necessarily evil - as was always understood by traditional morality that included such virtues as Prudence; which were intended to balance priorities.
But since the middle 1960s and the advent of the New Left (later political correctness, SJWs, Woke-ness etc) - monomania has become the dominant and official public morality of The West; rotating - often with extreme rapidity - from one monomania (class, or race) to another (feminism, or trans-lib). Indeed, the New Left implicitly defines itself as the party of monomanias (aka. the 'rainbow' party).
Well, Western civilization sowed the wind and is reaping the whirlwind. The world is now gripped by a monomania - and without any balance, moderation, or overall persepctive. There is no line which will not be crossed in pursuit of this monomania - no taboo which cannot be broken, no principle of basic humanity that will not be violated, no essential of life that will not be discarded - when any-thing comes into conflict with our global monomania.
As part of this same process; Traditional and Orthodox religion has committed sudden mass suicide - and publicly, eagerly, subordinated itself to the monomaniacal authorities.
What remains is the discernment of the heart; which we all and each possess. We each have that which is divine within us (being children of God) and we each have the possibility of direct knowledge from the Holy Ghost.
None are ever left without divine guidance to navigate through the complexities of life and to achieve the correct (prudent, balanced, principled - as it were) decision in any situation - if (but only if) we discern, acknowledge and follow that guidance.
Such as discernment of the heart will tell each of us that the mass monomania is intrinsically evil - both in principle and in detail; and will inform us what ought-to-be.
Of course, it is unlikely that we will personally be able to do exactly what will be the best course of action; but by knowing-it, we can (and should) repent our failure to do-it.
And the discernment of the heart cannot persuade any other people that we are personally correct; but that isn't going to happen anyway; since monomaniacs do not acknowledge any reasonsing or evidence except what fuels their mania.
The point is that we are not all-of-us dragged down into the mire of damnation willingly-inhabited by the monomaniacs - even when there are millions, or billions, of them.