You meant it intensified; they existed and attacked the shipping route before this conflict escalated.
Also, many people forget the modern West uses retaliation as a tool against terrorism. Basically, if you mess with civilians, you'll face swift and harsh consequences. The attack legitimized a retaliatory response.
That's why it was confusing when Hamas initiated this phase with a terror attack, as Israel would invoke the retaliation card, supported by the USA. Humanitarian concerns become secondary to the objective of neutralizing or controlling Hamas. Crying for more humanity or boycotts won't significantly change the priority list.
The best outcome Hamas could have hoped for with the attack that started this is what's happening now: chaos, more hate, conflict, and the end of normalizing relations between the USA and some Middle Eastern states. They knew Israel would use the "9/11 card," and the USA would allow and support it.
Just to be clear, I neither support any form of "genocide" nor take sides in the Israel-Palestine conflict. It's odd to categorize so broadly and inclusively.
If you believe China's reluctance to participate in these maneuvers is due to the genocide allegations, then it's improbable, considering China isn't known for opposing genocide, (especially against Muslim groups). Practically, what Israel is accused of aligns with China's agenda – acquiring land, eliminating cultures, religions, and populations based on ethnicity. Just because China is more discreet doesn't make it morally superior.
Example here: Uyghur genocide.