"Deadlifts hurt your back".
Don't blame the movement.
Blame the way you're doing it.
If you don't lift from the hips but you bend from the back then yes you may have a few problems.
But we are designed to pick up heavy shit and carry it.
Our backs are strong. And believing that they are anything but can lead to even more problems.
Yes there are exceptions. As in everything.
But in actual fact, I see more problems with people who don't lift heavy than in those who do.
There is no bad movement guys.