Add in the fact that the US government is known to lie constantly about these matters, and believing its current claims about Soleimani makes as much sense as believing a known compulsive liar who has deceived you many times when he tells you it’s urgent that you go murder your neighbor right this instant.
Debating the current Iran situation, then, is simply a matter of holding the unassailable positions that (A) the US government lies constantly, and (B) the burden of proof is on the party making the claim. In a post-Iraq invasion world, the level of proof required is very, very high, and the Trump administration has taken no steps whatsoever to even providing anything that could qualify as evidence.