"Who's to Blame for Higher Gas Prices?"
Wrong question. Right question: "Why have gas prices gone up?"
The idea that someone or something must be "to blame" is at the root of so many misunderstandings of how economies work. It assumes intentionality where outcomes are largely emergent. To understand market processes, you need to get away from our evolved disposition to see intentionality where it isn't. Economics requires that we consider the possibility of unplanned order and systematic outcomes that no one intended. That is, as Hayek has said, the start of social science.
Note also that you'd never see "who's to blame for falling gas prices?"