Nailed it. The guilt cope is real.

Also he may try to keep his advice apolitical because, from a utility-maximizing point of view, if you can appeal to the moral conscience of people across the spectrum, rather than primarily to those with one political affiliation, the good you will in turn encourage will be greater.

(And let's suppose that there are good people who vote for any given party, and that those are the only people he's concerned with talking to to begin with. There are plenty of left-wing people, as you point out, who are all talk).