[Spivak]

There are two groups of issues, ones that stem from the core defining beliefs of the groups that cause individuals to self-label as members in the first place and everything else. You'll see a lot of unity on the former and surprisingly little unity on the latter outside of transient political coalitions of convenience. Once you stray from things that are rooted in the core values of a group you'll find huge amounts of disagreement and that individuals have extremely varied views taken holistically.