Who's to blame for Rwanda?

I blame the UN because they were offered help during the crises but they decided not to accept because they thought Dallaire wouldn't be able to handle it  and they also said they "didn't want put Dallaire in something he couldn't finish".  But if i were them i would have taken the offer because something is better than nothing in this case if not all other cases. As far as they knew Dallaire could have had a good plan, which he did. So they should have just taken the offer.