I'm sure conservatives have the same views on the other side, something negative, based in fear. If you think about it, all of politics is fear of change in a direction we don't want, but others do.
In a family when this happens, family members talk about it and try to understand eachother. At least in a good family. In a dysfunctional one, family members go to war with eachother. And that's what I see in politics. There is no feeling of being humans on a ball together at all.
How can they know if an email is disposable or aliased? I use those all the time with fastmail. Works fine with github.
But fastmail is not exactly private since it's hosted in Australia, part of the five eyes pact. Maybe that's why they are ok with it.