I'm an open Zionist (although not the rabid Netanyahu-loving kind). I'm willing to accept downvotes for defending that position, but at least as a German who is currently an academic student and not associated with an employer I don't have to fear social repercussions for it as well (and notably, I write under my actual name).

Other people, particularly in the US, but also Spain or Ireland where the culture/social sphere is widespread anti-Zionist, might choose to not do so for the reasons I mentioned.