The proscription of Palestine Action is ridiculous and shameful.
But so is this article. If you turned up in support of ISIS then you should be arrested whether you're old or young, blind, deaf, in a wheelchair, doing cartwheels, or anything else. Disabled people are capable of supporting terrorist organisations and to pretend this is absurd is to miss the point and cynically look for sympathy where it won't be found. Not only that, but being arrested for supporting a terrorist organisation doesn't mean you're "considered a terrorist."
Criticise the actual problem - that the Terrorism Act gave the Secretary of State authoritarian powers that it never should have, and she has now used those powers to ban a group that protested a genocidal war through non-violent direct action.