Earlier quoted context omitted.
> Castration is a bit of a brute force for population control. No reason we couldn't also give cats vasectomies. Male un-neutered cats, somewhat like some of their human un-neutered counterparts, are prone to aggressive, overly sexual, and territorial behaviour (including spraying). Likely fine on on an outdoor farm cat, but probably not what you want for a pet who lives in your house.
This feels awfully close to the argument that cats with claws cause damage. Specifically indoor cats, that will never have to defend themselves from anything.
A feral cat sprays in a way incomparable to a cat playing on a couch. They see another cat/dog/person/strange thing out the window and they will spray the door. You come into the house smelling like your friends dog and they spray your shoes. They spray their favorite places to sit or hang out to mark it as theirs. It is a really hard habit to break compared with scratching on furniture. It's not all that hard to train even a kitten not to be aggressive on furniture and it relies on giving them better outlets to scratch on instead, like a good scratching post and plenty of convenient cardboard scratchers, and actively discouraging bad behavior while praising good behavior. You can't really give a feral cat an outlet to spray on, they will spray everywhere they are if they are going to spray at all. It's a territorial behavior, not just rowdy play.