Ticks are not insects. They are arachnids. Anyway, insects were around long before dinosaurs. Certainly in the long history of dinosaurs, insects wouldn't have waited until the K-T boundary to evolve forms which sucked dinosaur blood. Furthermore, disease-causing parasites which kill all their hosts outright don't survive very long themselves. Virtually all higher animals have parasites, yet they survive. Just finding evidence that dinos had parasites doesn't really prove anything.
And for heaven's sake, don't let anyone clone something from the blood in that tick in the amber.
Re “Don’t let anyone clone something from the blood in that tick in the amber”.
Sorry, too late. Coming to a theater near you - Juraissic Park, XX - The Rise of the Ticks”
This article also gives new meaning to the phrases:
“Don’t tick me off” and
“Don’t bug me”
Mosasaurs rule!