If it isn't geo engineering. What is it?

Soooo this is off the deep end for some of the new viewers. But if we are to ask critical questions. This has to be one of them.
If a contrail is only cooled moisture from a jet stream.
Why do they end up 100km long?
Not dissipate in the sun.
How do they waft over real clouds and split them into mist?
ASK MORE QUESTIONS. SOMETHING AINT RIGHT.