I’m not going to name names but I’ve lost count of the number of people this might refer to.
Chancer: a person who dexterously and expediently changes or adopts opinions.
Two-faced chancer: a person who doesn't hesitate to dump people (or causes) when they are no longer of any use to them.
The funny thing is, I suspect that many of the individuals I have in mind will have no idea I’m talking about them because they’ve convinced themselves they’re on the side of the angels - or the right side of history, at least.
I don’t. I just think they’re unprincipled shits.