Yes, let's fund war profiteers and undertakers instead.
Iraq was supposed to be a cakewalk too. 5 days and $50 billion. In and out in no time. With over a decade of sanctions and a devastated economy how much work could it be really? Then hundreds of thousands or maybe over a million dead from fighting and effect of sanctions. Over a decade later see how well it all turned out? How stable the region is now that iraq is a shining example of western nation building? Imagine doing the same to a larger country with more than double the population. And in an area already so unstable and with nearby strong countries that would probably intervene. At least isis would be happy to be rid of iran.
So just kill them instead right? It is not anyone you know so who cares?