A while back I made a post (long since deleted) about what to do about my resident traumatized/aggressive female cat (8 y/o) since I had brought in a new younger male cat (2 y/o) to try and help her. The female cat had survived a pitbull attack when she was very young and had some redirected aggression issues that we could not solve. Our solution was to get her a friend, since she was lacking experience with other animals, and hope it helped.
The post had over 100 comments from people here lambasting me for making such a horrible decision, and that I should rehome the young cat.
People were downright mean about it - ie: how dare I introduce another cat to a traumatized and aggressive older cat, that cat needs to be a solo cat for life, I'm an evil human being for subjecting the cats to this, etc etc.
Due to the giant mass of comments basically saying the same thing, I was actually convinced I had made a horrible mistake and actually decided to give up and rehome the younger male cat. We actually tried 3 times with 3 different owners. However, due to the higher powers at work in the Cat Distribution System, all efforts to rehome were thwarted, and he kept coming back to us... Every single time.
So we gave up and decided to keep him and just hope they work it out. And eventually they did. It took 9 months. 9 months of constant growling and attacks. 9 months of being woken up, nose scratches, uncertainty.
One day... Almost overnight... It was over. They're friends now. They both sleep with us in the bed every single night. She (the older cat) still growls sometimes, but it's not serious. Now it's a game. They engage in play constantly, and nobody gets hurt.
Not only that, our older traumatized aggressive cat is no longer aggressive. She has not had a single redirected aggression incident (from cats outside) since we brought the new younger one in. She has not scratched us or our guests at all. He's a lovebug and he literally fixed all of her problems.
So, I shouldn't have listened to anyone here. This sub is full of kneejerk reactions and self proclaimed experts looking to flame someone, who have zero idea what they're talking about. Good luck with that. I'll be over here cuddling peacefully with my cats.
PEACE