I'm not counting all the obvious crimes against humanity, b/c those have worked out for them for hundreds of years.
I'm talking the decisions that were just counterproductive to them
#1: Letting Mihawk go - Was the model warlord, kept to himself & they still really need his strength
#2: Letting Blackbeard in - They at least knew he betrayed Whitebeard
#3: Blowing up Lulusia - Didn't kill Sabo & lets the world know of that power
I'm talking the decisions that were just counterproductive to them
#1: Letting Mihawk go - Was the model warlord, kept to himself & they still really need his strength
#2: Letting Blackbeard in - They at least knew he betrayed Whitebeard
#3: Blowing up Lulusia - Didn't kill Sabo & lets the world know of that power