The ongoing occupations, street battles, and riots by mobs of protesters in Thailand, Ukraine, and Venezuela are not justified.
I don't care for any of those governments. And I supported the ouster of the dictatorships in each of those countries. But using the same tactics against an elected government - which plans to hold the next elections on schedule, in the usual way - is wrong.
Parliamentary systems are a little different than ours, in that public protest could force an early election. But the protests themselves need to remain peaceful, or they lose their moral claim.