Human's have a problem with using "self-hypnosis" to justify their lives and actions....it's called being a "true believer". It makes it easy on the mind to become a "true believer", because you no longer have to consider all the "myriad consequences and responsibilities of your path".

Look at the "cult of Jesus" or any "guru cult". They work by proclaiming that the followers are "absolved of all responsibility", which has been assumed by the guru.

Also, alot of people just need to feel like they "belong", so they seek out and join movements.

Do a google search for "true believer", and you will find alot of psychological research on why people do this.