I find it really stupid that i break my oath for killing goblins, It should be the other way around, if i let them roam free to kill and plunder other innocents i have failed as a Paladin or a Good person in general.
I'd say it's equal to finding a bunch of landmines and just letting them lie there.
Just because they didn't explode in my face, doesn't mean that they wont in someone else's.