Biden has done more to undermine the US empire in the last 8 months than Trump did in 4 years. Biden is exposing the contradictions of US empire in a way that Trump could never.
If Trump was president, then the mainstream narrative would be that the genocide in Gaza was simply because of Trump and Bibi's leadership. And you know what? Given how past presidents were able to rein in Israel when polite society started sympathizing with Palestinians, it would be believable. Instead, we get to see front and center, how a man that's been at the top echelons of us foreign policy for decades approves and supports genocide. This is the establishment's genocidal war.
In other words, Trump is perceived as an aberration, even when hes just continuing the same US foreign policy that weve been doing for decades. Moving the embassy to Jerusalem is still framed as entirely Trump's decision, even though he was just enacting a policy that Biden voted for in the 90s. And of course Biden did nothing to reverse that move, or even try to extract concessions to move peace talks forward.
Biden is damaging the "international rules-based order" in a way that would make Dick Cheney blush. Bush at least tried to put a veneer of international law on the criminal invasion of Iraq. But it appears the US and Israel are ready to burn the UN to the ground in order to carry out this genocide. Trump would be doing the same exact thing, except he would also serve as a scape goat for the liberal order (just get trump out of office, and we can go back to rule-following)
Don't get me wrong, they're both excellent accelerationist candidates. The world is watching two senile, hateful, egotistical vile men fight for control of the empire as the world burns.
This is more internal than international, but another way Biden accelerates the decline is by forcing the rest of the Democratic Party to goose step with him off the cliff. Under Trump they were able to become "the resistance" and present themselves as an anti-fascist party that was fighting back against the fascist turn in the Republican Party. Under Biden those very same people are now supporting genocide and law-and-order policies and protest crackdowns, and now the masses are turning against the Democratic Party.