In my youth, my brother and I had a pair of mice as pets, Luke and Marmalade. One morning we found that Luke had been (mostly) eaten by Marmalade. We re-christened the survivor "Marama-luke" and got on with it. Taught me a lot about life.
There's nothing objectively wrong with rodents as pets. Weeds are just plants growing where you don't want them and vermin/pests are just animals in a place where you don't want them. (Eye of the beholder, to each his own, if you could see her through my eyes, etc.)