What's up with these new rotors?

just for the sake of argument, ive witnessed two instances , both involving old mopars , where the bearing races welded themselves to the spindles because of misalignment of the bearings inside the opposing race , also known as cross breading parts . the races got so hot riding on the outer edges that it took a hammer and chisel to get the welded races off the spindles, and ended up needing new spindles on top of it all.