So I mean the gist of the rant in my head is this.
Psychological testing, as in like, design of studies designed to approach psychological norms and stuff. It's actually a field of study on its own and isn't simple. It's because there's just a ton of variance in how people react to things creating a standardized testing set is difficult. It's brain chemistry sure but there are things in the personality, experiences, relationship with the person giving the advice, etc that influence how people are going to take any given treatment.
So I mean when you say "you're objectively wrong to ever be anything 100% but loving and supportive at all times when dealing with people who suffer from depression" to me feels like you read some studies and are taking way more from them than you maybe should. They are generally broad strokes and I highly doubt any formal studies have been compared between "total love and compassion" vs "harsh but trying to be helpful" and even if there were it would be of dubious use to cite because everyone is different.
The role of a psychiatrist is to establish a relationship with the patient and determine what the best course of action is by understanding the patient and growing a relationship with them. I would say yes they should never be mean, and I would say yes they should always be supportive, but I don't think love and kindness are always the best tool for them to use. This of course depends on the situation, the patient, their rapport with the patient.
Some people simply do respond better when told more bluntly and a support circle that is too kid gloves with them can put them into an apathetic state or a state where they get some sort of form of community by being one who suffers from depression which itself can be harmful. I can't cite a study on this per se, only anecdote. But I feel anecdote when taken with some use of empathy and intuition, as psychology goes, is useful, because it's simply not something we can approach purely statistically yet. Maybe in the future we'll develop ways to measure things beyond "you are not producing enough of this chemical or are producing too much of this other one" but at the moment we aren't there yet.
But this is just musings from a guy who grew up in a poor community and has a lot of experience dealing with people who have depression in close personal relationships as a result, has struggled with depression himself despite not currently identifying as someone who is suffering from it, and has taken some courses (I took quite a lot of them because I find it interesting but not enough to have a degree just fill a bunch of elective slots in my degree). There are some people I would never be as bluntly harsh as I have been with you here, but although we aren't close I do know you at least a little over the years here and my perception was you could take it at worst wouldn't be harmful. And there are some people that I know where I know receiving that kinda input from me or others has legitimately helped them (myself included from around 5 years ago, again, if I count) so I figured I'd give my two cents just in case it did help at all.
Also yes 5d chess moves unironically help sometimes!
No problem!
This is a cute and pop genocide of love!