I'm afraid you're wrong in that efforts like yours play little to no role. Efforts of the few will be the ones that drive progress - as they always have.
It's unfortunate that there's a lot of back-office politics that happen in relation to the oil companies, and not just them.
The argument that you're bringing up seems to be against politicians as well - the people you elected to make those decisions for you.
We have a government because we just can't be bothered to make the right choices on our own - we need leadership. The system has become corrupt and that leadership is now being elected without input from voters, but it is only because of their apathy that this is possible in the first place.
If more people took charge of their lives (like you did with making a conscious choice to reduce your carbon footprint) instead of relying on others to decide for them - maybe then we'd have the Hallmark world you're on about.
Though you are correct, oil companies have indeed contributed hugely to pollution, I must also point out that without them, we'd still be in the dark ages. The synergy between them and auto manufacturers creates more efficient engines that create less emissions every day. Those are the engines we rely on to get goods to where they need to be and the police and ambulances to respond in time to save countless lives.
It takes 1.2 million gallons of fuel for a single space shuttle launch, and there were 130. The information we now have about the world we live in is invaluable. This is just one more thing among millions that oil has made possible.
All that progress is not driven by pure motives, it cannot be. Those who want nothing for themselves can rarely give anything to others. Of course there are guys at the top of these companies that are in it to make a profit. Some of the tactics they use are despicable - absolutely - and there is no excuse for that. What there is, however, is a bright side - from their greed and their bone-deep desire to make money hand-over-fist we get an industry that helps us live comfortably, safely, and achieve more in a day than those living a hundred years ago would have done in months.
If you want someone to blame, help yourself, but blaming an entire industry, rather than a few extra-greedy individuals seems a little rash and misguided.