After thinking about this - a lot - in the last couple of days, honestly, I don't think there is a good time. Certainly not at a Mass celebrated for a different cause. It would be very out of place. There is quite a lot more to life and living than sex and its consequences.
Abortion isn't an STD, it's murder.
general discussion regarding anything having to do with sex is still not socially acceptable and makes many people very uncomfortable.
Better uncomfortable people than dead babies.
The hammering on this topic should be consistant, but not thundering. Gentle persuassion will be much more effective.
So we should speak out about abortion? Is your disagreement with tactics? You seem to contradict your first statement.