Meh. That is threefold law, not rede. The rede states: "An it harm none, do what ye will".
Lark's reply to what the rede entails explains it well in my opinion:
The threefold law simply states what you do comes back on you three times over. However, this is not true. Not in this life at least.
Someone who kills a man, does he die three times over in the same way that he killed another? Does he suffer three times over what he did to others?
This man who killed another, lives in a prison now, well taken care of by the state, is that the sense of he has been punished three times over?
A child is killed by someone, what has the child done wrong in their short life that deserved to be killed for?
What has the family done to deserve to lose their child?
Threefold law ***only*** applies to those who believe in it. You basically cause it to happen. Either by your guilt and wish for punishment pulling things towards you and into your life, or by you noticing bad things happening and attributing them to punishment.
We are mere mortals, the universe need not pay one lick of attention to us. It is the universe for god's sake. It is enormous and we are so very tiny. Like an ant thinking an elephant cares about what he does.