Whilst I agree with you to a point
F1Brits_90, sportsmen and women are humans too, they all have feelings and emotions that sometimes get the better of them. I hear what you are saying about at that level of the sport and so on, but demoralise a driver and then see what results you get from them, I guarantee they won't be good.
Ask anyone who does anything well and they will often tell you that a lot of how good they are comes from their own mental strength, confidence and attitude. If you don't believe you will do well, more often than not, you won't. If you don't feel comfortable in your surroundings, you won't be able to give your best. As an old example, HH Frentzen did really badly at Williams, he moved to Jordan and he was like a different driver again. At Williams he didn't feel comfortable and the team weren't able to make him happy/settled/confident enough to drive to the best of his ability. I remember reading how Patrick Head didn't believe in that sort of thing, which is his right of course. At Jordan they tended to coddle their drivers more. There he was much happier and his results in the car got much better too.
I'm not saying all the teams have to run around playing nursemaid to their drivers, it's just that some thrive better in different scenarios than others. Gasly didn't get on well at Red Bull for whatever reason, Albon seems better able to cope with the atmosphere there.