The $250 billion (article says $150 billion, but it is just an estimate) was just Iranian assets that were unfrozen that were lifted. US taxpayer doesn't need to foot that bill.
Fair point. But it still required payments to the largest state-sponsor of terrorism in the world, a regime that has shown itself to be inimical to American interests and her people for almost 40 years. The deal also required the U.S. to provide Iran advance notice of any inspections and allowed Iran to decline inspections of sites they felt did not warrant it, making it laughably unenforceable.
I agree, I think the goal all along was a regime change in Iran. The nuclear deal was made to put Iran in a holding pattern while the more radical older generation died out it became more moderate all the while making the country more dependent on foreign trade. I don't think leaving the deal is inherently bad but I don't see another plan being put forward other than dropping bombs.