Samwik,
For all intents and purposes, there are no absolutes.
I personally believe that there are absolute truths, but I have no ability to prove any of them beyond doubt.
That is why philosophical analysis has 'weak proofs' and 'strong proofs'.
A weak proof is something I believe based upon, for instance, anecdotal evidence. A strong proof is something that is logically coherent or has good scientific evidence. And that's as far as you can go.
Prove to me that Hitler existed:
There are photos -
"yes and it's wonderful what you can do with Photoshop".
There is film footage -
"special effects - giant conspiracy by Jews to get sympathy".
People have seen him -
"only got their word for that."
etc.
You cannot truly know anything for sure.
I believe that it is 'absolutely' true that America put a man on the moon.
But the reason the conspiracy theorists thrive is because it is not provable. It could have been a deception - how can you know otherwise.
You cannot even prove that you exist, or that if you do you don't exist in a Matrix-like virtual reality.
Brains in jars.
I don't even know that you exist. You may be a very clever computer program.
Blacknad.