Which part are you objecting about, the implication that the US blindly supports Israel, or the implication that Israel's occupations are unjustifiable?
Anybody who holds a simple one-sided opinion on Israel/Palestine is wrong, full-stop.
Criticizing US government officials for their excessive support of Israel is reasonable. Blanketing all of Israel's various incursions into Palestinian territory as "unjustifiable" is bad for the discussion and makes an otherwise-reasonable person look extremist.
Why is it that people who know so much about one thing feel compelled to open their big mouths about something else they clearly know so little about?