It depends on the situation. If I ever tag someone and it's blatantly my fault (accidental or going for a gap) I always try to make a point of not only making sure they're back in front of me, but backing off a little bit for a couple of corners for them to get back going. If you knock someone off line and hold back initially but immediately stick your nose back into a gap that's not there you're not racing fair IMO.
To be totally honest it ends up being my downfall in some of the bigger races, especially mid to back of the pack in national A's where these days fair racing seems to have taken a back seat in favour of winning at all costs. It's a shame there's so few people at the sharp end you can have a fair/proper race with now
