Because voting third party is also a vote for whoever wins, using this logic. Libertarians, Green, etc party voters constantly get accosted over this.
You have two top candidates, by voting for a third party you are deferring to the popular vote on the top two and 'subtracting' a vote from your favorite of the top two.
You have two top candidates, by voting for a third party you are deferring to the popular vote on the top two and 'subtracting' a vote from your favorite of the top two.
https://i.redd.it/qdg4kntdh3jc1.jpeg