It might do, although I'm far from convinced it would. And if the odds on a Trump win shorten, that may cause lazy Democrats to get out and vote rather than staying at home rather than being complacent about a Biden victory with Trump on long odds.
So you're saying it's a moral duty to bet on Trump winning, so long as we use any winnings constructively instead of just drinking them to numb the pain?
But as I outlined above., the cumulative effect of betting may influence the outcome.