Oh, so Joe Biden has committed genocide?

Yes.

So you are saying that the president of the US has the power to stop the genocide of Palestinian people, and "Genocide-Joe" just chose not to use that power?

Maybe not quite as simply as you put it here, but also yes. Israel doesn’t make their own Iron Dome.

But then... why haven't I seen any "Genocide-Donnie" spam

There were a ton of protests, have you not been following his fascist takeover of universities across the country and his illegal defunding campaigns that are specifically about silencing dissent on the genocide in Gaza? Have you just completely missed that?