A new deal with Iran looks dangerous, because it may hand the country money and freedom to keep building nuclear weapons.

• The U.S. can't easily destroy Iran's deepest nuclear site, buried far deeper than the bunkers already bombed.
• Iran is pouring concrete over tunnel entrances to make the facility even harder to hit from the air.
• The deal releases $24 billion of Iran's frozen money with no strings attached, so it could be spent on weapons.
• Past deals limited that money to humanitarian use; this time there are no such limits.

Outlook: If Iran uses the freed cash to harden its nuclear program, the risk of a wider conflict grows.