Obviously you can't attack all points of concern, in one person's head, at once. But as pointed out on this site, by creating doubt about one theory, I'm sure you can start to create a subconscious change in some people.
So if we were to attempt to deal with chemtrails, we can see that people are fearful for their health, and at the same time astounded that many other people are not aware of the issue (as I was). We can create a sympathetic dialogue based around these issues:
The vast majority of other people are still not concerned, but not through ignorance.
The vast majority of scientists are not strictly controlled, and would speak out if there were such proof.
The vast majority of media is not strictly controlled, and many outlets would like a big scoop.
The vast majority of theories are propagated on facebook, youtube and small websites.
There is zero proof of ground operations that match the requirements of such an operation.
Some people will suffer from health issues, but there are scientific proof of the causes.
Once upon a time they weren't worried, and didn't they feel better about the world?
There could be many more strands to add, but what I'm saying is that you need logical reasoning that doesn't require the user to adopt science, that is already disputed by the chemtrail community. It needs to be simple.
It's nice to see other people here, saying they've changed their thought process, but it's in amongst some lengthy threads. I'd like to see a single thread or even website that contains basic facts, and some science, but a real winner I think, would be personal testimony from those who did believe, now realise they were wrong and how much better they feel now they understand things differently.