I've trained forearms, it is good to train them, for the strength.
But yeah, as they do get hit in-directly remember you can work up as slow as you like with weights.
I don't take the usual approach with forearm work outs. I build up very slow in terms of raising weight and if I don't feel like doing any exercises for them I won't. Forearm exercises burn me out easy, and considering you need your arms for 90% of your movements killing them aren't a good idea.