Yes

I remember when we had a "mouse problem" (I hate to say that) in a house in the US, and there was no way other than using mouse traps in the end. That place we were renting had just too many gaps in the flooring and everywhere. Tried first with putting away all food, doing the dishes already while cooking dinner, and such, but no way, we had the mice even going after our books, found a cable with insulation chewed off.
We refused using glue traps - awfully cruel -, used snap traps instead. There were so many, we just could not go with "it's just one mouse, it will just run out of the door". The night we installed the traps, we had already caught three within minutes, and over time, it were more than a dozen.
It had really saddened me, also knowing that despite it might have been a quick death for those trapped, very likely there have been young mice hidden somewhere suffering a bit longer.
Also other things with animals, like when I really have to throw out food because of insect infestation (and maybe even bought the food already containing these insects) and with that, throw the insects into the trash: it saddens me.
I'm okay with feeding animals to animals if necessary (otherwise I would not have gotten a bearded dragon), or watching animals catching other animals and eating them (remembering a hawk nest nearby, interesting

and I had katydids as a kid, watched closely how they caught and chewed up insects) - I had almost ended up studying biology and never saw nature as "Disney" - , but I'd rather avoid if not necessary, also for what I personally consume (eat, or use otherwise, or how I garden if gardening is possible where I live).
So nice to see

I'm also really surprised that despite he is quite aggressive out of fear, he is not shy.
Mine was shy for months, really no way to get him sit on my hand or accept food directly from my hand; but I guess yours might have the underlying personality of daring things more easily, just not in the friendly way right now.