Thank you for starting this thread. This was an ideal time for Trump to make a move against Iran. He will leave Joe Biden to clean up the mess.
Trump has already left a mess:
1) The Iran deal gave us a decade's worth of time to work on Iran's aggressive foreign policy. Trump walked away. Iran declared that it would keep to the deal as long as Europe continued.
2) Trump then applied brutal economic sanctions on Iran, with the goal of regime change. But the Iranian
ulema have long declared that nuclear weapons is un-Islamic. Khameini even issued a still-standing Fatwa on the matter. Regime change would bring in the military. The Iranian military has long declared that Iran must create a nuke. Trump's dimwitted sanction threaten to introduce the Iranian military to power, thus the best possibility for an Iranian nuclear arsenal.
3) Meanwhile, Trump's brutal sanctions began to seriously hurt Iran. Iran hates Chinese communism. But China is exponentially thirsty for oil and has long wanted to re-establish the Silk Road to the Mediterranean. China offered $600 billion in economic life support via financial and material trade for oil. China has also long "secretly" provided assistance towards Iran's nuclear program. Trump's dimwitted sanctions (and obnoxious and insulting behavior towards China), not only pushed Iran closer to China's orbit but, provided China a window into the Middle East.
4) Trump also betrayed the Kurds, an ally that had fought along side our troops since at least 2003. By doing so and evacuating, Trump handed the Syrian territory over to Russian and Iranian influence. Why Iranian influence? Hezbollah has long been an ally to Syria's dictator, Bashar al-Assad. So, Iranian influence in the region now extends from Tehran, through Baghdad, and directly to the Israeli border. Trump's treachery for Putin and complete lack of integrity offered Iran geographic proximity with Israel. Iran effectively shares a border.
5) Trump not only green lit the assassination of Qasem Soleimani, but paraded it around as if he himself rode in on a white horse with a saber to do our military a favor. But the assassination merely saw to the promotion of another so that Iranian foreign policy may continue largely uninterrupted. This is like assassinating General Mattis and imagining that there are simply no other America Generals. This goes right back to the apparent assassination of this scientist. Whoever did it was short-sighted and stupid. Another scientist has already been promoted. The aggressive foreign policy goes on. And we no longer have influence over it. <--- This takes us back to item 1, where we once had a decade to work on Iran's aggressive foreign policy.
So, Biden is inheriting a Trump-made mess that will not fix easily. Through Trump, America proved to the world that it cannot be trusted. No deal is secure beyond the next election. American Presidents no longer work in a collaborative manner that best suits the nation. Trump ruined all of that. Not even our allies trust us anymore. Trump has handed Intel over to Putin, denigrated democratic allies, and celebrated autocracies. So if our friends can no longer trust us, why would Iran?
But take heart you Trump supporting morons. Trump moved the embassy!