I think coons have their young in spring and kick them out of the area when they are old enough to fend for themselves. I don’t bother trapping coons until I have nearly ripe fruit because a couple will likely keep others off my property. Once I kill them the migrants start moving in, depending on population pressure in the area on any given year. On 3 acres I always have to kill a few, but on bad years I kill over 30.
As far as drowning them, I do feel this is a cruel form of execution having performed it once myself. Watch a coon die this way and you will probably agree with me. A pellet to the brain usually brings death spasms and quick death with one shot, probably much kinder than what nature otherwise has in store. I hate it when I catch a feisty one that won’t let me get such a shot and I end up having to shoot it several times with my high powered pellet gun. The last one was a big mean tom that kept breathing, so I dumped him out of the trap and blew off his head with my shotgun. Not pretty at all.
I love raccoons but they don’t belong with chickens or fruit trees. It’s stupid to move them because anywhere they can live they already do and unless disease knocks down the population there are always too many of them. Humans have eliminated their predators while vastly increasing their sources of food. The responsible thing is to kill them, IMO.