Why every one (most)is taking politics so superficially , trust media , then make stubborn views ?

Some pplz are SO stubborn and opinionated while they have no proof and lots of them r just repeating what they hear . . . Like when a guy say that invading iraq was to liberate iraqi pplz this is a BULLSH!T ! Am speaking generally why every1 is so stubborn abt his political theories and why others trust the media so much ? Is there any logic behind that ? Like . . . When some1 say 9/11 was inside job others go 19 arabs . . . . Etc. Do u excpect a white CIA guy to fly the plan there ? In case it is right those arab amatures will be just puppets . . . Any one is getting my point ? I mean whenever we think we know the truth we find that there are deeper hidden layers any one agree with me ? Thx guy and feel free to criticize my grammer haha just be helpfull and tell me my mistakes so that i can avoid them later . . . Peace