The Iranian government recently murdered at least 200 (according to the UN and Amnesty International) and perhaps over 1000 (according to US officials) unarmed Iranian civilians. Many were shot in the back as they ran away. [1,2]
How can Iranians still support that government?
Sanctions are probably the wrong approach - they tend to hurt ordinary people far more than the government - but if I were Iranian, living under a regime that's willing to shoot me in the back, I'd hope for regime change.