There has been some international criticism of the IDF actions that caused a lot of civilian deaths, but probably less so in the US and Germany where it is very difficult to make any criticism of the Israeli government without being labelled antisemitic. This means it's socially and politically safer to say generic things like "we stand with Israel no matter what". Ironically there is far more critical debate within Israel itself.

Consider that online at least, you may be in a isolated bubble so the opinions you hear may not reflect how the general population feels.

It is also very easy for groups to manufacture group opinions/sentiments online.

For what its worth, I am largely seeing the opposite sentiments here (but i am in my own bubble).

I think you're looking at history the wrong way. Consider for example World War 2. After a surprise attack by Japan killed 2,403 Americans, the USA and Japan fought a war that left well over half a million Japanese civilians dead. About that many German civilians also died from Allied bombings. Meanwhile approximately 10,000 American civilians died - a hundred times fewer. That didn't mean that the USA was fighting on the wrong side...