One does not "abuse" free speech. For that to happen, free speech would have to be a privilege rather than a fundamental right.

We have an inalienable right to speak freely, to speak and think as we will. This right is a gift to us from God. It does not flow from the benevolence either of Man or of Man's government.

That does not make our speech or our thoughts intrinsically virtuous, or even require that we limit ourselves to virtuous speech and virtuous thoughts. Virtuous people will have virtuous thoughts overall, and evil people will have evil thoughts overall. Their speech will invariably follow their thoughts.

Can the denial of this God-given freedom ever be the result of a virtuous thought? No. There is no virtue in denying God. Nor can one use evil to accomplish a virtuous purpose.