Comment by Broken_Hippo

That still means you do not get actual public opinion. Public opinion doesn't consist of only strong opinions.

You seem to think that voting is a simple choice of "do it or don't" and it really isn't that simple.

You need little restrictions. For example, not every country takes away voting rights from prisoners or folks previously convicted as a felon. Some places are pretty lenient to pregnant folks, sick people, etc. When my mother was pregnant with my sister, due around voting day, they nearly didn't let her vote absentee. She argued and got to vote but how many people were just denied in this situation? It would be a non-issue in some places. It wasn't that she didn't have an opinion - she was just nearing the time for freaking birth.

When I moved to Norway from the US, I no longer had to deal with voter registration. Once I lived here 3 years, I could vote in local elections. They just send me a voting card. Voting is easy, can be done in multiple locations over a period of a few weeks. So long as I had the card, no ID needed. (most folks keep their address updated for multiple reasons, so getting it isn't a big issue for me, anyway).

Any barriers you have to voting - like the registration system in the US, inflexible voting times, or very strict voter id laws - means that some folks won't be able to vote even if they want to. Barriers that make it difficult for groups of folks to vote is just a way for the state to control the election instead of the people voting with their conscience.

21 countries have compulsory voting laws, on the other hand.

And you can't say that a voter's opinion is a strong one, just that they vote. So many folks vote by just voting with the party they chose. That's not a strong opinion. That's just voting, and no one is checking motivations to see.