No, I don't think it makes you a bad owner. Everyone has to decide for themselves how far to take it. I feel like if your pet is in pain, you should treat it as best you can, but I think there's a lot to be said for letting nature take it's course.
Everything in this country is getting so advanced and high-tech and expensive. It's sort of crazy. I would always treat a pet for pain, and be good to them, but please don't feel like you have to do all those other things in order to be a good owner.