While I get your understanding from my comment, I don't know if I'd call it both-sideism as much as I would neither is innocent. Either was quite capable of taking steps to stop this before it happened.
If it wasn't for the fact it had happened before in Ireland I would 100% say there is no way the differences could be reconciled to a permanent two-state solution - but clearly there must be a pathway to peace. Unfortunately I don't hold much confidence in it actually happening and more will continue to suffer because of it.