There are a lot of factors at play that make transness an easy target to be the scary other bigots rally around.

The simple truth is that unless you yourself are trans you cannot understand the trans experience. There is no way to explain the scope or impact it has on someone’s life. It’s automatically alien and provides essentially a permanent out group. Anyone who is uncomfortable with people who are different or that have different experiences than themselves are almost certainly transphobic to some degree. Right now to the best of my knowledge transphobia is the only thing all hate groups share.

Trans people are the current scapegoats because prior to the pandemic we had an explosion of trans people feeling safe enough to come out online (I blame Obama making us all feel safe). They are particularly effective because both white nationalists and evangelicals use queerness as a scapegoat all the time anyway so it was easy for them to rally around. Which is why conservative politicians fearmonger around trans people.

It’s not that simple, but it’s close enough for a lemmy comment.