This may be controversial for some, as it is an emotionally-charged issue. And it's really not a matter of opinion, so it might not quite fit in this thread.
But anyway... time and time again, so many people keep repeating the notion that Dr. McCoy euthanized his father in STV:TFF. Let's clear this up once and for all. McCoy did nothing of the sort. He deactivated the technological life support that was artificially keeping his father alive. Euthanasia, on the other hand, is actually administering something lethal (such as a drug) to end someone's life when otherwise it would have continued. Many people conflate these two different things. But legally and ethically, they are not the same.
Kor