Believe in yourself and your principles and start from there.
There is a problem though of would be dictators subtly conflating "principles" making choices hard. Look how many Europhile Tories ended up putting Boris Johnson in power.
Where does my aversion to the death penalty rank compared to my desire for decent benefits for the unfortunate ? What would I do if the only party offering the latter (luckily not going to happen) were to also have an official stated pro death penalty policy.