The Iran nuclear deal was far better than what we have now as far as containing Iran's nuclear program. When Trump cancelled it, nearly every single one of his advisors urged him not to. There were options in place if Iran violated it. But it was Obama's deal and that's all that mattered to the Orange POS. As of right now, Iran will continue to go full steam ahead on making the bomb, and their deep mountain facilities have proven impenetrable by any of our weapons - short of our own nuclear forces. So bad news for us.

Further, the Iran Nuclear deal was about more than just the nuclear program. It was a diplomatic pivot as well. Iran may be ruled by a dictatorship of religious fanatics, but their population is among the most westernized in the Middle East. The decades long timeline of the deal reflected awareness that the octogenarians who ruled Iran would soon be dead and if the pro western elements could take power, they might move closer to the west if we showed a willingness to turn down the temperature and enmity. Iran could even someday once again become an ally of the United States like it was before the revolution.

Trump ended that possibility permanently solely because he hated Obama.

As for going it alone, that rests on the Orange Idiot as well. Yes it would have been great if we had built a coalition like GHWB did. But Trump did ZERO consultation with allies before launching the war. He didn't even learn his lesson from that when initiated the failed Project Freedom, not consulting Gulf Nations, who were so insulted they initially refused the US access to their airspace and bases. The initiative failed anyway the moment Iran attacked a few tankers.