I vote for one reason. By not voting, you are increasing the power of the stupid fanatical extremist fringes. The two major parties love people dropping out because then they only have to worry about making sure they serve 1 more ‘core’ than their opponents.
Nothing is more powerful than voting 3rd party. 3rd party scares the two major parties because they know the other party could appeal to those voters.
I frankly, think the current system is broken. You win with a plurality, not a majority. If you don’t have a majority, frankly, you should be forced to do a run off against #2. With everybody getting to vote for their perceived lessor of two evils.
i.e. Imagine the shift in the politics if you could really voice your opinion for candidates without the fear that major party candidate is going to go into office with 43% of the vote.