There are some really nutty animals out there (some on 2 legs, some on 4) and it's good to have something just in case. Ultimately, each of us is responsible for our own safety. Suppose you're out for a walk and a rabid skunk shows up? Unlikely, but strange things happen every day.
Definitely go to a gun range and rent something to see if you're comfortable with it, though, before spending money. It might save you from backtracking and buying something different later on, for example, if you decide you want a smaller caliber or a firearm that operates differently.
If for some reason you decide not to get a firearm, one alternative is to carry a can of hornet spray that shoots a thin stream a long way. Better than nothing, for sure.