Ramshorn snails and plants?

I recently discovered what appears to be a young ramshorn snail in my 80g
plant tank.  I'm tempted to keep him/her/it around, but I'd like to hear
what people think as far as how kind (or brutal) it and its' descendants
will be to my plants.

TIA from Phoenix.
If common sense is so common, why don't more people use it?