Conservatives have opposed every diplomatic breakthrough for decades
Within hours of the announcement of a final deal between Iran, the US, EU, China, and Russia on nuclear disarmament for sanctions relief, Weekly Standard editor Bill Kristol was already appalled. "We have a deal," he wrote. "It's a deal worse than even we imagined possible. It's a deal that gives the Iranian regime $140b in return for ... effectively nothing: no dismantlement of Iran's nuclear program, no anytime/anywhere inspections, no curbs on Iran's ballistic missile program, no maintenance of the arms embargo, no halt to Iran's sponsorship of terror."
How, you might wonder, could Barack Obama be so naive? And what a strange coincidence that his naiveté was shared by David Cameron, Angela Merkel, and François Hollande such that a completely preposterous deal could be agreed upon despite possessing holes that are both massive and invisible to everyone other than American conservative activists. Well, if you want to understand the deep intellectual and psychological roots of conservative opposition to Barack Obama's nuclear deal with Iran, it's useful to take a step back from the details and look at a newspaper ad campaign conservatives ran in 1988 (via Jon Chait):
Yes, that is a conservative ad comparing Ronald Reagan to Neville Chamberlain.
You make peace with your enemies
"If you want to make peace, you don't talk to your friends," said Moshe Dayan, the former Israeli foreign minister and defense minister. "You talk to your enemies."
Conservatives don't believe in talking to your enemies.
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http://www.vox.com/2015/7/14/8960653/iran-nuclear-deal-conservatives-diplomacy
http://nymag.com/daily/intelligencer/2015/03/conservatives-hate-iran-deal-hate-all-deals.html