Telling the truth

This world is weird...
Some people tends to believe to what they think is the truth although they have been told...  
They might not notice that this act has greatly hurt those who told them the truth...

While some others people will chooses to believe what they see or what they heard from others as the truth...

I felt funny and frustrated when I was told about one thing and believes it, then being told by others "don't be so naive" ...
I was wondering that time, u think it is a lie, hence is must be a lie....?

Why some of the people treat certain things as a lie because they felt its impossible? 
And why when they didn't believe it cz they didn't think it is impossible, those people want to affect other people to think as them too??

Don't judge a book by its cover...
Not all the peoples in this world aren't honest. Just because they aren't honest  this doesn't mean u are not as well....

Just because one's does not trust may affect others not too trust as well ..   What would u feel if the one closest to you, being affected and didn't believe you?

This is the question I thought  after watched a movie that I forgotten the title?
Have you been telling the truth but not being believed, ended with being upset and felt that what is the purpose of telling the truth to them?