Most missiles have splash damage, some of them just have a really small radius. The ones I use most frequently, SRM-24 Scorpions, aren't torpedoes but have significant splash damage.
Usually what gets my fighters is premature MIRV explosions (since apparently they can go off before they're supposed to). Also, enemy squads tend to get blown up by this as well, it's funny. Except you get no exp for it which sucks
