I know very little about Joe Biden or American politics generally. I do know that an armed citizen against an armoured vehicle is going to end badly for the citizen.
Certainly the way it turned out in Tienanmen square. Oops, they didn't have guns, sorry bad comparison. No Afghanistan is a much better example, they had guns but not much else. Oh wait, another bad example, the Afghanis won that conflict.
I think the point is if you are an invading force that wants to occupy a land you don't want to level it to the ground and you don't want the 300 million people to all have guns in their homes.
Sure, if you land with 3,000 tanks no one with a rifle will be able to stand against the tank. But the US is a very big country and if you saw the movie "Saving Private Ryan" you know there are many ways to take out a tank. No one will stay inside a tank as they go 3,000 miles across the US. They will have to stop, refuel, reload, repair the vehicle and take breaks. Imagine having to go door to door throughout the entire US trying to track down all the guns? You would need a million men for that job if you even hoped to do it in a year. Meanwhile the populace will be hiding those guns everywhere making it exceedingly difficult to find them.
Also we have very many veterans who know military tactics, strategy and how to fight. Guerrilla warfare has worked all over the world.
Instead of attacking the tank try taking out the supply lines. Take out a few fuel trucks and the tanks grind to a halt. Kill a few mechanics and the tanks grind to a halt.
Perhaps while the soldiers are sleeping you could pour gasoline into a tank and set it on fire. Even if it doesn't destroy it, you could still cause significant damage.