An example of leftist "logic"

I was having a conversation with a leftist on Facebook about Obamacare.  He blamed the failure of Obamacare on Republicans who had sabotaged it so that the law that was passed was gutted of all the good stuff Obama wanted.

I asked him why Obama would have gutted Obamacare when he knew he wasn't going to get even one Republican vote and I was informed that I needed to understand the history.

This sort of reasoning is how every Democrat failure can be blamed on Republicans.

Obama pulls US troops out of Iraq too suddenly and we get ISIS but it's all Bush's fault for example.