It is actually a bit more complex provided you have an opinion as to which of the two major party candidates is worse. If you consider both equally bad then yes

It is actually a bit more complex provided you have an opinion as to which of the two major party candidates is worse. If you consider both equally bad then yes voting for a minor candidate has some small positive value, but if you consider one of the major candidates worse than the other then not voting for the other is a negative. I don’t vote for a candidate - I vote against my least favorite candidate. I find it much easier to decide who I like least than who I like most.