That insect is just a very ordinary fly that happened to fly by. It's completely innocent.
What you are seeing is called physiological leaf curl and the exact causes are unknown: mature leaves will curl upward as a reaction to sudden temperature changes, but the development of new curly growth... we really don't know much about it.
Genetics surely play a big part in it, as some cultivars are much more prone to it than others, but other factors... I really cannot say. As most cultivars merely become somewhat unsightly it's not really an urgent issue to address.
Be warned I had this condition on several first generation (unimproved) Black Krim plants and it ended up affecting their development to the point I pulled the plants from the ground... I'd like to blame a poor batch of seeds but their siblings, born from the same seeds, were absolutely perfect.
Since the late 70's (it was already mentioned in a book belonging to my grandfather printed in 1979) this condition has been blamed on "herbicides" but... it doesn't hold water, really. Herbicide drift was a problem in some crops before anti-drift addictives were introduced in the 90's but it looks absolutely nothing like this.
