They know voting is being suppressed. They just don’t care.
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Establish that voting is a privilege, by insisting that you need to vote responsibly to prevent Bad Things from happening
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Denounce the opposition as frivolous, infantile, and actively harmful to the public
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Rally around the police state and insist everyone in opposition is “breaking the law!”
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Use police violence as a tool to strip people of their voting rights
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Win the next round of elections and use that to cement your image as Democratic and Popular
Eventually, you just establish a kind-of inertial force that people buck at their own peril. Everyone just wants to go with the flow, so they don’t dispute something they believe all their neighbors fundamentally agree with.