Itzik, we have debated the Zionism issue previously. But very briefly, what is wrong with anti-zionism is the word anti. This by definition is a hashkafa which is anti the work that others are doing and from which many are benefitting. It means there is pure hate directed at another segment of a population for no reason. To be Zionist does not connote any hatred towards other Jews. It means love of Zion, and the rebuilding of the land. But to be anti means nothing other than sinas chinam.
I am not saying all Zionists were perfect. But no group is made up of perfect people. This is not a reason to hate an entire group and their work. How can one possibly have it in his heart to hate hesder boys or what they stand for, when they are moser nefesh to learn, and also to put their lives on the line for all Jews?