They seem pretty reasonable to me and I monitor this kind of thing for a living. There are absolutely groups that are this radical and organized. What dooms most radical groups is one of 3 things:

- inability to shut up leads them to boast

- LARPing revolutionary war shit makes them go for the excitement of massing at hard targets state capitols etc. where they are usually easily contained

- bloodlust takes over and a member cuts straight to murdering and is quickly located