Some issues are caused by interpersonal conflict / abuse, but we're delicate social creatures and a lack of family & friends can also be extremely damaging. I doubt people are going to therapy because of how their lover eats breakfast (except maybe extreme misophonia), but there are plenty of people justifiably upset about their complete lack of emotionally intimate relationships with other people.

And, as mentioned above, many issues can be alleviated by support from friends and family. At least ideally, if your spouse hits you, you should be able to ask your family or community for support. People lacking those outside relationships only exacerbates mental health issues caused in other relationships.

There is no love, care, responsibility, advice, touch, inspiration, devotion in therapy.

I understand why and it's useful at times. But we are severely limiting our ability to help people if we do not use those aspect of the human psyche. Dangerous and tricky as they are, we've now simply blocked any possible idea of using those for mental problems treatments.

That's what I meant in the first place, there are lots of issues with communities and social relationships. To not have to deal with those we prefer a more individualistic lifestyle. Understandably, but not everyone has been able to get those human experiences naturally and it's definitely a part of the problem.