Skeletal evidence shows that over the last 8000 years since the advent of farming, not only are physiques becoming slighter, but skulls have become smaller as well. The larger communities with a more stable food supply that agriculture has fostered allows for the weaker and more stupid to live and thus reproduce.
There are many reasons for people's stupidity.Some of them are:Pop Music,Sports,Politics,Reality TV Shows,TV content in general,mainstream media,Liberalism,Feminism,basically everything that ends on -ism,Abrahamic Religions,Ignorance,Intolerance