So if your 5-yr old picks up a gun and shoots your wife, you kill the kid? I know plenty of people who would take a horse that was in the wrong place at the wrong time like that. My guess is that the horse was euthed in response to public opinion.
Any horse can panic. If the horse was truly dangerous? Heck yeah, euth is the way to go. Being trampled in a freak accident...not so much. Maybe the horse was dangerous, maybe not. We have no way of knowing.
The lady wasn't trampled, she was kicked to death according to one of the news articles. There's a difference, in my mind, between being knocked down by a horse fleeing/bolting and being trampled in the process, versus being kicked at repeatedly until you sustain fatal injuries.
That having been said, I am sure that it was both an emotional response by the family members and in an abundance of caution, supported by law enforcement. Given that the horse had kicked her before, and this event was another kicking episode, to sell/give away this horse knowing its history, there would be clear liability if anyone ever got injured again. It would be just like a dog that bites being given 2 chances, right, and then it has to be put down.
Tragic loss. I wouldn't want them to put my horses down either if they "accidently" trampled me.. but if it's a habitual kicker... I really wouldn't want to, but think about it... if a dog attacks someone...what do they do? Even if they are protecting their own, and/or never has hurt anyone before?
Sad situation regardless.
(sorry for repeat of above, I didn't read all of them first).