so a man murders someone, and to rectify the situation, he is allowed to murder again?
there's that old saying, 'two wrongs don't make a right'. allowing murderers to commit suicide is like letting a child rapist force himself on an 18+ woman, because 'he didn't get it right the first time'. i have no doubt that people will misread this, and have lots of interesting things to say about the statement.
my point is, letting someone get away with a crime just because the crime was committed in the first place is a bad example to set for society as a whole. it doesn't matter what the crime is.