Many people, particularly on the religious right (no, I'm not accusing you of belonging to that group) are very uncomfortable with how much alike animals and humans are. Science continuously brings them closer. Do animals play? Yes. Do raccoons kill for fun? I'm quite certain some do.
In this case it was very clear from his behavior and voice this raccoon's companion knew there was a problem and that she shouldn't be in the coup. She wouldn't listen to him or to me, she wanted to kill pigeons. Period.
It is he I feel sad for. He was injured (not seriously) on her account and had to watch his wife die a horrible death. He isn't going to be feeling good for some time now.
#2 Parasites and diseases: Yes, we all carry them. Those carried by raccoons are of particular danger to humans though.
#2 Habitat: Yes, we have destroyed a lot of habitat. We have also built what ecological scientists call "the great urban forest". Many, though certainly not all, species have become highly acclimated to this environment, raccoons among them.
Here, a mile or more from the nearest undeveloped space, I see many times as much wildlife as I did on our (mostly abandoned) farm and forest in New Jersey.
So no. I do not feel sorry for killing this raccoon. Yes, I'm sad for her companion, and for the pigeons she killed and for their companions.
Pigeons are gentle, very family oriented, creatures (and vegetarian). They have personalities and relationships like all the rest of us do. They will even take over the feeding of another pigeon's child if that becomes necessary. They enjoy flying and fighting, splashing in water and building nests. They do not deserve to be killed for fun.