Biden's handing of something that 100% should fall in the domain of Congress to solve. So may things that historically have been attributed to the President were ultimately created and decided on by Congress and the public attributes way more power to the President than they actually have because of it.

But the public is right to do this, particularly regarding international wars like Ukraine and Gaza. The United States has not declared war via Congress since 1942. Yet clearly we have fought plenty of wars since then solely under the command and authorization of the presidency alone. Which means there is 80+ years of precedence of creating an imperial presidency that authorizes Biden to act against both Russia and Israel. He is choosing not to avail himself of the precedent. And genocide is the result.

we're legally obligated to supply arms to Israel,

Israel is legally obligated not to engage in collective punishment, ethnic cleansing, and genocide. Yet, they are doing those acts anyway. The Constitution requires Congress to declare war. Yet Korea, Vietnam, the Gulf War, the War on Terror, Libya, Syria, and Ukraine/Gaza demonstrate that is apparently an illusory Constitutional requirement. Laws are meaningless if there is no enforcement mechanism.

I'm fairly convinced that a good chunk of the rhetoric spouted to not vote for Biden likely originated from foreign sources to plant the Idea in people's minds

This is undoubtedly true. And it is a sad reflection of the weakness of our system, our historical actions, and the intellectual capabilities of our citizenry that it is as highly effective as it is. Trump will destroy The West if he is elected in November. And plenty of Americans don't have a problem with that because they don't understand what it means. Which is a consequence of neoliberal privatization and deregulation of all social programs, including public education.

As Malcolm X said, this is Chickens Coming Home to Roost. And, unfortunately for us who live in the United States today, an innumerable number of Chickens are coming home to roost in our very near future. I wish I had been born in Denmark or Norway - at least their social democratic safety nets would allow my community to thrive as the world burns around us