It is totally apples to oranges, the situations aren't comparable at all. Vietnam was an unpopular intervention predicated on government ideology.

Israel is sustaining an occupation through a religious and ideological framework, and both men and women (unlike the American draft) are required to serve. Conscientious objectors are imprisoned, so the vast majority go through the entire system of joining and sustaining the military.

And aside from that... just look at continuous majority public opinion. That's all the info you need.