There's only one choice, #2.

The chemtrail hoax started in the late 90s and of course many people believe something 'just because it's on the internet'.
Most people never pay close attention to the sky but after reading the nonsense about planes 'spraying' something and claims that real contrails can't linger that long, they were suddenly taking notice of a skies that had been that way since jet travel started.
It's simple psychology like when you learn a new word you never thought you heard, suddenly it seems you hear it everywhere.
It was always there but you just never paid attention to it.

Some chemtrail promoters will even lie to keep the chemtrail lie alive.
YouTube videos of contrails with scary music are not proof of chemtrails.
Chemmies have yet to produce any genuine proof there's some secret chemtrail operation going on.
Many of them are afraid to learn about atmospheric science because when they find out their 'chemtrails' are just contrails, they are too cowardly to admit they were wrong so they keep up the BS because it's some kind of pride thing.
And if you don't think chemtrails are real, you're automatically branded some kind of government shill. LOL
But I guess some people need something like chemtrails to believe in because they feel some sense of self importance by thinking they are helping to 'expose the cover up'. LOL
It's like a religion.