Soldato
Maybe I just find it hard to hate Michael Stulberg but I sympathise with Rothstein a little.
In Season 1, when he was in a vulnerable position Nucky exploited it and got $1 million off him. All Rothstein was doing was the same here.
As for Luciano, AR told them the deal was a stupid thing to do at that time. They didn't listen.
It wasn't a stupid deal to do at the time, it was the right deal it turned out, hence why Rothstein screwed them over in order to take the shipment and start in it himself.
And also I think Rothstein is awesome, actor is brilliant, I just thought it was a bit crap of him to leave Nucky high and dry when this all started because Nucky chose to have A.R as his sole customer (First episode), which is pretty respectful.