I don't think it's about law, it's about ethics. law is about rights and powers (over others), and it sometimes tries to reflect what is right or wrong, which is ethics' business. freedom, though often misunderstood as absolute, is often about finding a balance of what is right for all parties involved. in portuguese, we say one's freedom extends up to where one's neighbor's freedom starts. in english, it's something along the lines that one's freedom to swing one's arm extends up to someone else's freedom to be standing right there. freedom can be constrained without being infringed upon, but invading someone else's freedom is unethical, wrong, it's not freedom. that's what makes hate speech problematic: it's nobody's freedom to deny someone else's right to exist, to be, or to express a wish that their existence is terminated by violent means, because that invades their freedom not only of speech, but every other freedom of theirs.