The alternative is what the last five American presidents have done: containment. There's a reason Biden, Obama, Bush, Clinton and Bush didn't start the war that Trump did. This is why.
Trump isn't "strong" until he actually calls Putin's bluff on nuclear weapons. You're not gonna do it Putin, and I'm fully willing for me and everyone I know to die in WW3/nuclear holocaust just to make sure Putin goes to hell a bit faster.
Trump has done more pro israel actions than Biden
However, Biden is completely pro-Israel. He would do anything for them and has said so. Guessing he didn't think attacking Iran was the best thing for Israel. Well look at how it's going.