There is a virus going around, however. Much as a computer virus copies the behavior of an organic virus, this virus is contagious, can mutate into myriad forms, and can infect those with weakened immune systems. This virus is transmitted orally and through the written word, from person to person and group to group, and it can even be transmitted electronically through radio and internet.
Those most afflicted are the gullible, the ignorant, or the foolish who carry the rumors and speculations to others without regard for the consequences of their actions, which mimics transmission of an STD between consenting but careless people.
The protection for this very real contrail virus is a strong dose of common sense, and regular application of factual information thereafter. Nevertheless, even without treatment, time will eventually heal this virus, except in the most thoroughly entrenched cases. As time goes on, perhaps for years in some people, and persistent contrails continue to be seen year after year, all the theories developed years before will become more and more ludicrous. It is certain that those susceptible will become infected by yet another of these virii, if they do not acquire common sense and take the time to check what others tell them.