Why practical people are called clever and emotional people are called fools?

we come across so many decision making situations in life and it it’s either the brain or the heart that controls the decision. for example: let’s say two people are in a relationship and want to get married but there’s a difference of religion, the person giving up for the society, parents will be considered as clever and the person holding on will be considered dumb and asked not to waste life. have emotions stopped making sense? has the world become so cruel? why is religion or caste more important than emotions? why choosing them makes a person practical and clever?