The situation is more complex than that. What makes people react is how @EU_Commission is raising the Israel flag while it should have a Palestinian flag raised all year long.
Israel as a country/government has more blood in his hand than the Hamas. It is a terrorist country itself and any person living there, be it jew, christian or muslim, is at the very least passively enabling that.
What happened/is happening is ugly and I lament the suffering and death of people, but this is just one event in a very long lasting war between colonialists and their victims. As colonialists themselves, european should now better.
Besides, palestinians people are suffering as well from this. They are already lacking so many resources and healthcare, IDF army is and will strike back as well as cutting energy supply.
Ukrainians would probably resort to similar tactics as the Hamas against Russia, had they been abandoned like Palestinians have been by EU and USA. Let that sink in.