Put a gun to people's head to vote? I can think of few things more morally reprehensible than that. An individual should determine how, and if, they participate in civic life for themselves. The view that sees individuals as simply so much chattel labor existing for the benefit of whichever bureaucrats running the state at a given moment is simply unsupportable by any sort of real logic. To give you warm and fuzzies that vote-suppression did not occur is insufficient cause to demand that I participate in a system that, where I live, has no effective choices in any election cycle and frequently poses questions which simply should not be open to democratic opinion at the get go.
Your view is also terribly naive. If you get your way, what prevents the "shenanigans" from simply moving to another part of the process, say before the vote? Also, I would simply turn in a blank or random ballot because playing along with the sham of legitimizing the outcomes of questions where there is no choice is not tenable: do we stop secret balloting to prevent my antics? Do we evaluate the votes I make to determine whether or not I'm being a good citizen?
The big lie of much of "democracy" is, as a magician once put it, "When I cut the cards, I let you glimpse a few different faces. You conclude the deck contains 52 different cards (No. 1—Pattern recognition). You think you’ve made a choice, just as when you choose between two candidates preselected by entrenched political parties (No. 7—Choice is not freedom)."
Your proposal simply puts the threat of force to those that would not otherwise play the charade.