My friend does not drink when we go out. Everyone else does. Shouldn't he DD?

Okay, I don’t want to make this sound as bratty as it seems. Our friend does not drink. He still likes to go out with us on weekends though which is great, because he is our friend.

While us drinkers aren’t getting completely obliterated or anything, we do enjoy unwinding at the end of the week with a good buzz and to the extent that it probably would not be safe to drive (3 or 4 drinks in a few hours, max). Sometimes one of us drinkers needs to DD, so we’ll be good and stop after 1 drink. And it’s sort of frustrating because we have our non-drinking friend right there!

I know we shouldn’t EXPECT him to drive every time we go to the bar or a party, but wouldn’t you say it’s good form to offer to do so when you know there will be drinking involved and all of your friends are drinkers except you? It’s like, why should one of us “take one for the team” when we already have a team member who will always be the most capable of DDing? We are not inviting him solely because we need a DD, I just feel like if we’ll be participating in a social activity where drinking is the obvious centerpiece, he may as well, right? I’m still happy to pick the guy up whenever we’re doing something else, maybe a movie or lunch or hiking – but, I don’t know, is there a way to ask him if he doesn’t mind DDing without sounding like a jerk?