Not voting is just a much a right as voting itself. You can’t be forced or shamed into voting for a candidate that doesn’t represent your views.
Besides you can always write in any one you want. You aren’t forced to vote for just the 2 guys on the Rep / Dem tickets. Wasted votes? Face it any vote you make that doesn’t go to the winner is “wasted”.
There are very few major differences between the 2 that will impact your life. The liberals are winning by pushing their social agenda through the courts and both parties are converging in regards to economic matters.
What’s the US population now over 300 million? It’s stupid to think that just 2 parties can represent the diversity of beliefs with a body politic that size. Unfortunately, the cards are stacked against any 3rd or 4th parties.
Refusing to participate is a valid "free-speech choice" at least in how in relates to "voting for the lesser of 2 evils". Politicians ought to earn your vote not demand it.
So vote or don’t vote the choice is yours to make.