What happens when an idealized individual freedom collides with concrete societal need? What happens when "freedom of speech" is used to spread lies, disinforma

What happens when an idealized individual freedom collides with concrete societal need? What happens when "freedom of speech" is used to spread lies, disinformation, and injure the fabric of a country? Is the point of freedom of speech because it leads to a freer people? Or is it for its own sake? If the former, what happens if it's shown that limiting freedom of speech by banning purposeful misinformation helps society as a whole? I kind of think we're there. I'm an ethical utilitarian (well, mix in some contractualism) and I think generally what's best is what benefits the most people most of the time. Maybe that's limiting the voices of those who are trying to deceive people and breed hate.