Most alarmingly (and as explained in this 2012 Atlantic article, there's compelling evidence that a parasite often found in cat feces can subtly change people's personalities over time, increasing rates of neuroticism, schizophrenia, and perhaps even suicide.

In other words, research is telling us that cats are selfish, unfeeling, environmentally devastating creatures. If you need to convince someone not to get a cat, here's the research you need to show them.

What research says about cats: they're selfish, unfeeling, environmentally harmful creatures

P.S.:
Now, don't get me wrong. I'm convinced that few people I know will have the same admiration as I have for #felines. Allow me to explain.
I was for several years a dedicated practitioner of Okinawa Go-Ju Ryu Karate Do. Ryu means style or school. Go-Ju means literaly hard-soft (or strong-quiet as I prefer to think) and the animal to imitate is the tiger. Let me emphasize: The #strong, #quiet, #solitary, #free and #wild #tiger.
So, I feel myself authorized to tell you that #cats should not be taken as #house #pets. :-)