I've owned an honest to goodness aggressive horse. Not some hot head who liked to kick or your run of the mill fear rearer. I am talking about a don't turn your back on him, God help you if you try to get in his stall with him, Heaven forbid you were to fall off of him while riding, horse. I would have challenged anyone, your heros or not, to come try to change that horse. If they didn't get killed trying, they would have packed their things the first time he came charging from across the field. I did what was right for him and had his misery ended before he could hurt someone.
Theres an 'off topic' shift for you. If you encountered a horse with real, honest to Chrysler aggression where anything with breath in 100 feet of that horse was in danger, would you have him put down? Or try to convince him with studies and lurve?