At least chemtrails ARE visible if one wants to notice them, and normally there would be no necessity to debate their existence.
Much abuse of power is invisible, and one has to experience structural difficulties and to see through this abuse.
Then we learn when it is too late.
It seems we face a huge monstrosity with many facets.
How could it become so big?
Why do most people seem to support it?
Not everybody gains profit from it.
For example, we know about environmental problems for a long time, like pesticides or animal protection, citizens are aware and politicians, but still they use the first and omit the second, but they talk about it regularly.
Every single individual can decide what he does, but the world doesn't seem to learn or to change. It improves only in small steps.
Mankind seems to learn slowly.
If everybody would notice chemtrails as a problem, that wouldn't stop them.
People still smoke, despite they know it's wrong.

Did it ever happen in human history, that a people somewhere deprived a tyranny successfully?