You can lead people to the truth but you can't make them think.
When I was a boy, the old farmer next to our home had a small herd of pigs (~6).
One day, our cat died and we had it over by a tree in the corner of yard to be buried later on.
The pigs got lose from their pen and we noticed them wandering around close to our yard (we didn't have a fence).
When we went to bury the cat, it was gone.
We concluded the pigs ate the dead cat.