Personal Opinion: Banning Thresh/Vayne

It is wrong for me to ban Thresh every game even if I play as support? Should I transfer the ban to Vayne or other champions whenever if they're overrated such as Malphite?

In my opinion, I think Thresh is more dangerous than Vayne because he has two displacements skills and can just easily save his allies, I can play support champions such as to counter him but I don't think it's working because the game often gets overturned when Thresh and his duo go to other lanes and engage in team fights even if we win the bot lane.

I mean, that would apply to Vayne to snowballing as well. However, I think she is kind of more conditional and tricky to overturn than Thresh.

Your tips or advice would be much appreciated, I am open to assumptions because perhaps it's my fault for my lackness of skill plays against and push away the Thresh.