Sounds like the farce of modern liberté, égalité, fraternité, as in fraternité ou la mort. Just try not to be my brother!

Moral sentimentalism is a fool's errand, because it isn't morality. It's a superficial emotional ersatz, not something rooted in sound reason and reality. And so "universal brotherhood of Man" was always farcical. It's like those people who "love humanity", but can't be bothered to feed the homeless guy on the corner, or treat his wife decently and with due care. It always has to be something "grand" and "out there". It replaces authentic, concrete local allegiances - all relationships are local - with abstract, impersonal "brotherhood", which ultimately destroys real social cohesion.

Yes, there is a "human family". But family and community are not some undifferentiated, homogeneous mass. Society is ordered and composite. While we can love all as a matter of general disposition and wishing them well, love as such is manifested in the concrete and the active, not mere affect or the abstract. Our priorities and duties of love must concern concrete persons. They radiate outward and diminish with distance (by nature, but obviously there is an obvious impracticality to "loving everyone" in any meaningful and substantive way). Your duties toward your wife are greater than those toward your brother; toward your brother greater than your cousin; toward your neighborhood than the next one over. This priority is not either/or, and they do not preclude aiding more distant siblings in an hour of need. Loving one person more than another does not mean hating the other or some kind of license to disrespect the dignity as that person. It does not give permission for jingoism or chauvinism.

In the hyperindividualistic, consumerist liberal developed world, the trouble is that we've become atomized. We have denied our intrinsically social nature (just as collectivism warps it and denies our individuality). In doing so, the social order has been thrown into chaos. That's the chief reason for our social ills. In our misguided desire for "liberty", we have throw away objective morality and the notion of pre-consensual duties. We live to consume, and even our relationships are reduced to transactional conduits of consumption. Our culture is nihilistic; all it knows is consumption. There is no greater horizon. It cannot understand the social truly and in a healthy way, only according to the language of consumption. And all that obstructs unbridled consumption is taken to be opposed to "liberty" and therefore something that must be destroyed.

It's the revolutionary ethos of destruction.