Haha, oops!
Apparently we can delete infractions after all! That's just me looking in all the wrong places there. Still, the principle is the same. If you have an infraction that you deserved, you'll have to keep it. It's not part of our job description to go round deleting people's past misdemeanours because they want their profile to look prettier.
However, if you have a reversed infraction, give us a shout and we'll delete it for you, by all means.