" how ? " questions entail facts related answers, while answers to
" why ? " questions can be twisted by prejudices

Take for example astronomy

" The sun and the planets must turn round the earth because the universe has been created for us, their orbit must be a circle because it is perfect ..."

The direct consequence of " why ?" questions are " the ultimate end " , " the essence " , " the universalis " and similar junks which science has finally swept away