I understand that as they are paying, students expect academics to recognise those things as well. Obviously some don't.
Can you explain what you mean by this, please? Who do you mean by 'some', specifically?
I am not saying that accommodating MH needs means lowering standards. I am saying that not all needs can be accommodated, and that in a place of learning, where difficult ideas need to be considered, those who are unable to consider them can not be accommodated without watering down those ideas. As has been pointed out, but as you choose to ignore, there are many types of MH problems, and those that can be accommodate are.
It's not about discrimination - it is about education. You still haven't explained whether you believe that it is ok to discriminate on grounds of examination results when it comes to admission. You may not think it's relevant, but humour me? I have answered questions from you that I don't see as relevant.
So, about correlation and causation. Do you understand the difference, and how would you apply your understanding of those terms to your (unsubstantiated) claim that a decline in suicide figures is related to a rise in no-platforming?
You say yourself that there is a 'more caring and considerate attitude' these days. Compared to what? How is 'caring and considerate' measured? What is the relationship between a 'caring and considerate attitude' and the Mental Health of students? Was their MH measured before, during or after this change in attitude? How has the act of no-platforming been separated from other 'caring and considerate' acts to measure whether or not it has had an effect?
If you can answer those questions, I might believe there are grounds to begin wondering whether there is a causal link, but if not, it is no more than a guess, which is not a good basis for policy.