I like squirrels (so do my cats
)! I love watching them through the French doors running along the top of the shed and up the oak tree. Nothing wrong with squirrels.
Wild boar have been reintroduced, in Scotland I think. Very tasty.
Foxes run through my garden frequently. I used to feed them regulary, as did my neighbour. They didn't bother the cats who seemed to be at peace with them. Some were mangy and I got some stuff from a local fox trust to treat them, with some success.
However there were cases locally of foxes becoming so used to people that they'd nibble a small child, even got into the house and chewed on someone's ear while they were in bed. It wasn't just one case, there were several and it's true they became quite tame. I had a couple who came into the kitchen when I had the back door open, they were eating the cats' food, but they ran away when I appeared. So I decided to stop feeding them. We have lots of woods nearby where they can hunt small wildlife, indeed I often saw them chasing things, so they only wander, or run, through my garden now. I was worried about the mangy ones but haven't seen any like that for ages.
They're certainly no worse off for me not feeding them. My neighbour stopped too, not only for the same reason as me but one died at the bottom of his garden where there is dense foliage and shrubbery, lay there rotting away, so his wife put her foot down (neighbour's wife, not fox's). Foxes tried to dig up one of our deceased cats, after that we made sure there was a lot of weight on the grave and next time chose cremation.
It used to be nice seeing the fox cubs, so little and playful, but there's no point in being sentimental. They are interesting animals and have their place.