This is an extremely myopic take. I don't think I have seen many -- let alone "most" as you prescribe -- comments in any forums that resort to "war bad". Even on HN what I've seen is people with a strong sense of justice and ethics actively speaking out against atrocities being committed using US taxpayer dollars.
As for your line about people not knowing the history -- partially fair enough. Though that's also a propaganda line spread by Israel to keep people out of the metaphoric town hall. If you really believe that to join a movement you must first learn the entire history of all concerned parties first, shouldn't the same apply to any comments about Israel, or the US? I don't see pro-genocide commenters being told to shut up because they don't know the completely history of the Ottoman Empire.
As for your line about people not knowing the history -- partially fair enough. Though that's also a propaganda line spread by Israel to keep people out of the metaphoric town hall. If you really believe that to join a movement you must first learn the entire history of all concerned parties first, shouldn't the same apply to any comments about Israel, or the US? I don't see pro-genocide commenters being told to shut up because they don't know the completely history of the Ottoman Empire.