Why are “reasonable restrictions” allowed on freedom expression?

Reasonable restrictions include libel, slander, or speech which causes an immediate danger (yelling fire in a movie theatre that has no fire, yelling bomb in an airport) Freedom of speech is meant to protect opinions but various courts have upheld that they are still restrictions. This is primarily for safety and to ensure people can differentiate from opinions and things being communicated as fact.

on june 23, 1972, the president signed title ix of the education amendments of 1972, 20 u.s.c. into law. title ix is a comprehensive federal law that prohibits discrimination on the basis of sex in any federally funded education program or activity.