I feel like the turrets are beings who after being destroyed countless times, don't care about anything anymore, especially the life of a champion. It slowly charges each shot without a worry in the world. If you die trying to fight under it, so what? If it actually manages to help, whoop dee do.
The answer, of course, is to stay out from under your tower with divable or snipable amounts of hp and to lock down any tank who tries to open up the tower and those under it to being attacked. That sad part is, in certain situations (
), this is easier said than done. Even doing the second thing I mentioned may lead to the tank flashing away while your team is killed under their own tower or the tower is destroyed.
But tanks are tanks. They might take a lot of shots, but they won't likely do much in a tower dive on their own. Not that standing under a tower for a full blown minute at half build is okay.