Notes on why one can't just 'not care' for mental health:
* Prior to separation, it could not be ignored as it used to happen nearly daily, which for me involved her beating herself up badly, shouting at the max of her voice, with my child also seeing all that and feeling helpless. Those around and the lawyers told me that if the wife makes any false allegation against me, I'll be doomed for a long time. And it has ultimately gone that route. (One should not ideally let it get this bad, exit timely, etc., however it is not that straightforward in practice.)
* With the lawsuits going on, there is a lot of work involved. It's more than a fulltime job in itself along with the usual fulltime job. This is because the wife just makes random false claims, which does not even require them to think. It's the defendent who has to research and file documents to show that she is making lies. Even with no expectation of benefit from the legal system, it needs to be done anyways as the situation would only be worse if not done. While in theory it's 'innocent until proven guilty', that does not mean in practice that the hard work is before the wife. The hard work is still before the husband. So even if you try to, you cannot ignore the legal work that continues and brings functional stress.
* There is a moral responsibility towards the welfare of the child. So just letting go does not fit.
* I see many men give up. They yield to the unjust and frivolous demands of the wife to avoid the above stresses. Giving up encourages more women and their unscrupolous lawyers to do the same, which would go on to make lives of other people worse. Hence, there is a moral responsibility to keep trying hard for justice for sake of others as well.
* Even if one is able to mentally let go of what is happening, there are things missing from life, which I sorely miss. Psychology research only says that it's very tough and leads to depression, etc. I have myself read a lot besides having professional help. If someone were to ask me "If you know and understand so much, are wise, how come you are still in so much pain?", my answer, because even the theory says so. Not easy to circumvent the theory!
* And so on.