Earlier quoted context omitted.
You mean folks choosing to protest under the guise of a proscribed organisation? Protesting in favour of Palestine remains legal, doing so under the name of a proscribed organisation is not. Admittedly, the reason for them being proscribed is rather idiotic.
That's exactly it. The proscription is ridiculous and delegitimises the whole concept of proscribed organization. It collapses into "mere support for Palestine is an arrestable offense". This didn't work against Sinn Fein and it will not work now.
They broke into a military base. If that was sanctioned by the organisation, they should be shut down.