I think we need to have a tough dialogue. Military attack is not an option. Economic sanction, at least a blanket economic sanction, is not an option. Boycotting dialogue again is not an option at this point.
We have to be realistic and choose between bad and worse. The bad thing is having dialogue, but the worse thing is just boycotting dialogue. At least with dialogue you have some instrument to put pressure on the Iranian government. Human rights should be the first and foremost priority.