Fair enough:

Aliens & UFO's - Numerous sightings back in the day. Multiple crashes with strange coverups. Multiple presidents saying when running they will get to the bottom of it. Nothing ever happens. They only way we will ever know is if they ET's do a Independence day attack and there is no way they could be denied.

Poisoning of the populous through vaccines, Flouride, aluminum, chemtrails - Numerous studies have been performed showing how bad flouride is, some of these have even made MSM, yet if you speak about it, you are still a theorists. Vaccinnes causing cancer, etc.

Plnaes such as Malaysia MH370 - What happend to the plane. Was it really to kill the patent holders?

Then we can take a dive into the murky waters of political conspiracies:

Clinton cartel - The amount of bodies that have been suicided under suspicious circumstances with ties to the Clinton Crime Family. CGI.

Pizzagate - Child sacrificing and pedo. the evidence is overwhelming, yet outside of a random politician at moderate levels, nothing ever gains legs. What was on Weiners laptop? We will probably never know.

Seth Rich - Did he really happen to be killed in a botched robbery in one of the safest areas in DC? Right when he was blowing a whistle?

Secret NWO like the Bilderbergs, Rothschilds, Israel, jews - Are there groups that are secretly or behind the scenes controlling most of the happenings throughout the world.

So many more: 9/11, Vegas, JFK assasinated by the bankers, Holocaust.

It just seems to me for most of these, you have had whistleblowers who have come out and stated these did in fact happen, or at the very least did not happen the way the "Official" story was narrated and spoonfed to the MSM. I dont think we will ever know the truth about 9/11 0r Vegas. The actors are too high up and the coverups run to deep.