Re: I for one...
"There are many nice people in both Israel and the USA who are utterly appalled at their country's warmongering and killings."
Many; undoubtedly true; but not enough.
The same equally could have been said of 1938 Germany.
Unfortunately in nations like AU the concurrence of Zionism with Judaism (both the religion and the ethnic identity) is ~100% so any opposition to the policies of Israel or to Zionism itself is equated with anti-semitism and now with potentially severe legal sanctions.
Publically uttering or displaying "a flumine ad mare" can get you two years not that our plod ever aced the classical tripos. Pretty much any questioning of the legitimacy of the modern state of Israel might get you even more grief, even though historically the question isn't without legs.
The irony is that Zionism was as much a product of the late 19th and early 20th century Wilhelmstraße in attempt to thwart British imperial ambitions in the Levant prior to 1914, as of the aspirations of a section of European Jewry. British governmental involvement was largely opportunistic and towards the end of WW1.
No amount of history can ever justify the atrocities commited today. History might provide a lesson but never a justification.
I cannot help thinking that there are parallel between contemporary Israeli policies and many of the mistakes of the Outremer (Crusader States) which ultimately resulted in their destruction.