I'd add, to some extent conspiracy theorists keep government and industry honest. Or at least is skeptical about their honesty --with good reason. Quite a few so called conspiracy theories turned out to be actual conspiracies. And some conspiracy theories turned out to not be conspiracies (like moving away from trolleys when cars became the main mode of transportation)
Turned out to be true:
MKUltra
Biden mental decline
Reagan mental decline
Epstein blackmail
Iraq WMDs
Carnivore (syphoning internet comms)
Lots of the programs Snowden revealed
Steele document
Lab theory for Covid
etc.