I'm not claiming this has ever happened to me (it hasn't) so maybe that's just being contrarian?
I guess, as a US citizen, the rights and protections afforded by the constitution are sort of a hobby of mine. And I believe issuing tickets to someone who may have nothing to do with a crime is a violation of due process.
That's it. I'm not arguing that speed limits are bad or shouldn't be enforced. My only argument is to give the ticket to the person who committed the crime or infraction. That's the way it happens if an officer pulls a speeder over. Why is speeding per a camera treated different than speeding per a law enforcement officer? Don't make someone else have to prove they are innocent.