Your argument for the inability to have serious discussions here has been something I've mentioned before, and something I wholeheartedly agree with. Nearly everything is always claimed "inappropriate" to talk about here, and it speaks to the intelligence and maturity of a lot of the posters here now. There are more and more posts that function, essentially, the same way as a 3rd party chat app group, and less posts that are meaningful. It is alarming, however it is something that has remained to be changed for years now. Unfortunately, I fear the frequent posters of today aren't capable of changing that. Nor do they want to.
The free speech excuse most people don't understand, I made a thread about it before but freedom of speech means freedom from political persecution for speaking out against your government. It does not protect hate speech towards other individuals.