You're falling into the sinful error of pride, assuming that everyone is evil except you.
None Is Righteous - What then? Are we Jews any better off? No, not at all; for I have already charged that all men, both Jews and Greeks, are under the power of sin, as it is written: “None is righteous, no, not one; no one understands, no one seeks for God. All have turned aside, together they...
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"What then? Are we Jews any better off? No, not at all; for
I have already charged that all men, both Jews and Greeks, are under the power of sin, as it is written,"
“None is righteous, no, not one;
no one understands, no one seeks for God.
All have turned aside, together they have gone wrong;
no one does good, not even one.”
“Their throat is an open grave,
they use their tongues to deceive.”
“The venom of asps is under their lips.”
“Their mouth is full of curses and bitterness.”
“Their feet are swift to shed blood,
in their paths are ruin and misery,
and the way of peace they do not know.”
“There is no fear of God before their eyes.”
Therefore, since all men are sinners, all we can ever hope to do is choose the lesser of evils in this lifetime. Until the arriving of Christ's Kingdom, life will
always be about choosing the lesser of evils, since all is evil.
Thus, by refusing to vote, you increase the amount of evil in the world by not choosing the lesser of evils. You engage in willful delusion that by doing nothing somehow things will get better, which is the very definition of pride, since all delusion is pride.
The not voting part isn't the real sinful part - it's the motivation and intention that causes one not to vote, which at root comes from pride. That pride is absolutely cancer for your soul, and by not voting you allow that cancer to grow and corrupt your very own soul.
As it is with most Christian commandments, Love thy Neighbor is also for the benefit of oneself. Once you stop caring about your Neighbor, it will not be long before you are consumed with hatred and indifference for man, and your separation from God will be complete.
Thus if you aren't voting because "both sides are evil," you've lost the entire point of the Bible and Satan has you deep in his grips.