Hi, im new to this forum and i thought this would be a good way to start off

A few days ago I was going through one of my favorite aviation forums where someone asked about the procedure for starting a jetliner. I didnt find this odd at all since there are many aviation enthusiests on this site that are often very curious about aircraft operations. A few of the airline pilots posted some preflight and startup checklists for various different aircraft, information that is readily available on the internet. Then some poeple started to talk about this being a threat to national security, and giving this sort of information away could be assisting terrorists.

So i would like to hear everyones opinion on this, do you think this is a threat to our security or just a bit of paranioa?