Is it your position that fraud does not occur, and therefore we should stop everyone from trying to prevent fraud? Sounds implausible, both in premise and conclusion.
By fraud, I'm including all types, from systemic, party driven fraud (e.g., stuffed ballot boxes and preloaded voting machines), to party encouraged/enabled fraud (like the Dems sending filled out voter cards to non-citizens, with the citizen box checked, as just happened in Texas), to individually motivated fraud (e.g., "I'm voting in NH and VT becuase NH doesn't check residency.").
To argue that the billboards are voter suppression is totally asinine and beyond any logic at all. If those billboards keep some people away from the polls, then we definitely do not want people like that voting because they are either fraudsters or delusional, so the billboards are a good thing either way.
The best argument for taking down those billboards referenced in conor's first post is that they are a waste of money because voter fraud has no real effect on any elections. And yet, it is extremely likely that voter fraud does effect elections (Franken was once elected by a margin smaller than the number of felons that voted in his election).