Maybe not the MOST morally corrupt thing, but the only one I feel kinda bad about.
Legend of Zelda: Breath of the Wild. I need to collect all these chickens, but some old lady won't let me into her plum tree garden because what if I DAMAGE her PRECIOUS trees? These trees were her only reason for living!
So I'm pretty pissed off about this, because I just need to grab the chicken it's RIGHT THERE.
This game gave me infinite magical bombs, so. I toss one into the garden and detonate, mostly out of idle frustration.
A bunch of trees are destroyed. The old lady yells at me.
So I keep doing it, because if all the trees are gone, theres no reason for her to chase me out of the garden, right?
Finally all the trees are gone, and this old lady basically says "oh... I've got no reason to keep living..." and waddles away slowly, presumably to kill herself.
I think to myself "this seems really dark" and google the chicken/plum tree puzzle.
I was meant to wait until night time, when she would go to bed.
I destroyed this old lady's soul for a chicken.