I'm glad that Big Jim killed off the Fight Club skanky b*tch and her thug. But too bad that Barbie will get the blame. I don't know why he didn't just kill off Big Jim when he had the chance. He didn't mind killing off Julie's husband, so it shouldn't bother him to kill off this tool as well.
He had no choice but to kill Julie's husband since he drew on Barbie. He was on a suicide mission to eat a bullet and have Julie collect on his life insurance policy because he had gambled away the house. I don't think Barbie wanted to kill him...he was just out to make some money shaking-down gambling debt.