These are Iranians dancing to Pharrell William's Happy. The dancers were released, but the director is still being held as of now.
Tyrannical regimes arrest people who hike into their territory. There were even rumours that the Albanians shot machineguns at wind surfers who strayed too close to their territory.
Just think of what would happen to someone who criticises the regime (or would be really stupid and advocate overthrowing it). And if you walked around carrying weapons (although some of these countries that is acceptable behaviour--after all, they will gas you or wipe your asses off the map with more firepower than your puny weapon is capable).
Think about that the next time you decide to call the US repressive.
Repressive--you haven't fucking seen repressive.