Voters need protection from coercion and misinformation. While coercion usually involves violence or payment, in practice they usually involve indirect methods of execution.
Example. Consider a publicized event where a group of people vigorously spout violent rhetoric against a political side. An individual in that political side may feel threatened away from voting, even with the anonymity of the ballot-filling process. Such indirect coercion is intensified if politically active individuals are known to have actually been hurt or killed; or if the demographics of that political side are well-distinguished and known. Widespread direct threats are inefficient, risky, and hard to enforce; making an example of a small number of targeted people will be much more common. Being a qualified target on the wheel of misfortune produces more fear than being issued a mostly empty threat that everyone received.
Example. Consider the elderly who may be sweet-talked into signing mail-in ballots; the homeless and desperate who may be given food or money then bussed into voting locations. Such reward-based coercion has operatives who hide their agenda under the pretense of being on the only side that cares about them.
The normalization of divisive language can accelerate a violent bandwagon effect. This is the heinous strategy of the few who would manipulate the population to viralize their indirect coercion. Sharp, emotionally-fueled political discord is a fast path to broken friendships and family ties.
Voter identification is a crucial control against double-voting, identity fraud, and unqualified voting by non-citizens and non-local citizens.
Auditable Paper Trail