If one votes, one participates. If one participates, one condones and endorses the process, and subsequently, what those elected ‘representatives’ do and say in your name.
Reason 2. Electoral promises are meaningless because politicians are able to lie to gain the favor of the electorate, and then do exactly what they want once they have it. Then there is no accountability or recourse, other than waiting another four years or so to vote them out and replace them with someone else who will follow the established template and do the exact same thing.