It takes away from the sacrifice of giving your life for someone, if you return in another life and physically abuse them. But that's what the Doctor did in his egotistical Sixth incarnation. In a post-regeneration crisis, he assumed his companion Peri was in fact an alien spy, likened her to a fairy, and then strangled her. The idea behind it was probably to introduce a Doctor as loopy as the Master, and in that sense, it worked. But it's a moment despised by many Doctor Who fans even to this day, compounded by the direction that Peri's character went after that, eventually having her head shaved and her mind wiped, for her body to be used by a Mentor. Colin Baker has in the past claimed that he takes the bullet for the other Doctors by being "the unpopular one". It's not exactly a stretch to see why sometimes.