They probably think it’ll help the hostages in the way that their idiot group are quoted within that article you linked.
In a statement cited by the Jerusalem Post, Tzav 9 rejected some of the protesters' actions, saying that "acts were committed today that are not in line with the values of our movement".
It added, however, that "blocking the trucks is an effective and practical step in which we shout that 'no aid passes until the last of the hostages returns'".