And Finally...

Money and motive. I actually live in one of the few cities that do this.

It is not a perfect solution. And as dumb as this sounds. That is often used as a reason not to spend on such plants. The issue is you simply cannot capture all co2 from burning. And still have to do something with what you do capture. Of course this in no way makes land fill better. But there is a reason for the phrase "don't let the perfect be the enemy of the good. ". Building waste energy plants is more expensive (much) then continuing to fill a land fill. And people do genuinely use such arguments to refuse the spending.

Add to that local authority government is normally so low turn out. That a few a noted voters can prevent things happening. And you have your answer.