JazzG not even remotely close. You seem to think collective punishment is legitimate and defensible even though it contravenes every ethical principle the modern world was supposedly built on.
Beyond that, terrorists (which is a bad term to begin with) should actually have to cause terror. Vandalism is not terror. This is how you end up with absurd circular definitions no English professor would accept in a secondary school paper, like the FBI in the US's ridiculous definition of international terrorism:
Violent, criminal acts committed by individuals and/or groups who are inspired by, or associated with, designated foreign terrorist organizations or nations (state-sponsored)
Essentially, we determine that terrorism is terrorism if we determine that it is terrorism.
Proscribing Palestine Action rather than simply prosecuting individuals for their own criminal actions (which is reasonable and, indeed, the point of such protest) makes a mockery of any possible definition of terrorism that holds any water. Furthermore, it is an insult to all those who have actually experienced real terrorist attacks, devaluing their suffering for the sake of scoring cheap political points. This is all while defending a rogue, genocidal state that is committing actual, honest-to-goodness acts of unadulterated terrorism in its only true form - to cause terror in civilian populations for political purposes.