The problem is too many people thought their states were safe when they weren't. Wisconsin, Michigan, Pennsylvania. And even in many states that went blue in the end, the margin was too close for comfort.Depends on where those no votes are coming from. There's nothing wrong with voting no if you live somewhere like California or New York, your vote only really matters if you come from one of a dozen-ish states.
The more people who think their state is safe and stay home, or toss their vote to a third party/write-in, the less safe it ends up being.