Male loneliness is primarly due to men having no friends and self-isolating.

Getting a girlfriend is really not going to help much if you have no other friends.

Hence it is men's fault due to their self isolating and not trying to get or maintain male friends.

Men, if you care about the 'male loneliness epidemic', then reach out and be friends with these lonely men because that is what they need. A circle of friends.

Men are more likely to have smaller, less diverse networks and to lack certain forms of community participation

https://aibm.org/research/male-loneliness-and-isolation-what-the-data-shows/

Not only thar but young women are actually more lonely than men. They just don't really complain about it.