I agree with you that the government doesn't have to necessarily resign but the fact that they were democratically elected doesn't give them the right to do anything they want. The people have the full right to voice their disagreement with the actions of the government, and I happen to agree with the demands and sentiment of the overall protests.

Unfortunately the Romanian people have been lagging (on average) when it comes to civic involvement, education, mutual trust, mutual respect etc., which lead to the election of the current populist government. There are signs that this is changing, slowly, and that makes me hopeful.

Since PSD was voted by so many people and is in the right, why isn't there any significant counter-protest?

If PSD would've governed by sticking to their political principles, their proposed agenda and within reason, there would've never been any protests. Sure, people would be upset because they have different political views, but you would've never seen 600k people on the streets.

Democracy is not a blank cheque and your argument of "they won fair and square" does not allow them to send us back into the dark ages ESPECIALLY for their own very specific interests.

If you think there's anything wrong with my logic above, then you're probably a lost case.

Other than the fact that they tried to decriminalize many corruption offenses triggering the largest protests since the fall of communism. As many people are saying: thieves shouldn't be let go just because they've been caught and gave everything back.