For instance, arrange marriage. my family wants me to marry a girl from my caste even though two of my uncles who married to the women of our castes are going through the worst marriages ever. i gave them this example and asked if it is reason enough for me to marry whomsoever i want irrespective of caste. not surprisingly, my family still wants me to marry a girl of my caste.
so they are more emotional than rational.
but since i want to strike a balance, i am marrying a girl who is from a different religion since i love her a lot and see a great future with her. i don't care what my family thinks about it because it is a logical thing to do.
Reason is never helpless. It is just that emotions are an easier way out, almost an escapism.