You are absolutely right, it doesn’t give them a right to wage war on the Palestine people. Although Israel can and should ‘defend’ itself, it has gone way too far, killing thousands of innocents for no apparent gain. It is a disgusting over use of force and should quite rightly be condemned.
I would argue however that Israel isn’t a colony of Europe or the US, that would imply control over the country and as has been quite apparent, Israel is making it’s own decisions and will happily shrug off any criticism from the Western powers. Using words like colony just derails the narrative you want to imply. It is a country created after the second world war (rightly or wrongly) and the horrors of the Holocaust. Does that excuse Israel now? No, absolutely not. If anything I should think they should know better.
Israel needs regime change and a willingness to work with those that surround them and the same goes for Hamas. Religion, ideology, ethnicity, it’s all an excuse so easily used to justify violence and unfortunately I don’t ever see it changing.