Overly cynical viewpoint - I know my own views on a whole host of things have changed over the last decade. If we were all held to account for things we believed at other times in our lives/careers we'd never progress as individuals.

Lots of things can be seen as politically convenient, e.g. drumming up fear of Islam and Mexicans. I'd rather a politician that was advocating for a politically convenient positive change than a politically convenient negative one.

Sure, one that consistently advocated for positive change would be best. But have you seen polls about the number of people who believe in witchcraft or support Trump? In the US, we arrive at bad choices because around half of the country believes and supports bad things. We'll have to fix that before we can expect more from democratically elected politicians.

Still better than not evolving.