Should I feel upset and guilty after seeing my parents kill a fruit bat?!

Somehow a fruit bat managed to get under the net which was covering a fruit tree in our backyard. My father did most of the prodding with this wooden stick, which was putting holes in its wings while it was screeching, and then he hit it with a plank while it was still in the tree, shaking and barely alive, killing it. This went on over 10 minutes or so as I watched from inside, because I'm sensitive to this kind of thing, but I felt bad, I felt like I could do something about it while I was inside and it was still alive, and afterward I knew that I didn't.

My parents were too cautious and careless enough to try to go under the net and capture the fruit bat in a bucket, because it had claws. The way the net was set up and knitted over the tree would have been a day job to take it off and put it back on is what they said. My father buried it in the yard and I ended up crying later, and I still feel sad, like I should have stepped up and told them to stop so I could go under the net and try to catch it in a bucket or something and let it go. I know there was a way around it, and it didn't have to die. :(