Remember the old canard, "I might disagree with what you say, but I'll fight for your right to say it."
A "canard" is an intentionally false story.
The words you put between quotation marks are a misquotation of a statement misattributed to Voltaire: "I disapprove of what you say, but I will defend to the death your right to say it."
Neither the misattributed statement nor your distortion of it make much sense. What sane person would
fight for or
defend to the death anyone who said something like "Eat all babies!" or "Defoliate Europe!" or "Exterminate inferior peoples!" And who except the product of a twisted educational processing factory would argue that there is some
right to advocate such behavior.
The early Twentieth-Century nobody who distorted the Eighteenth-Century philosopher's words later said that she had in mind this statement by Voltaire: "Think for yourselves and let others enjoy the privilege to do so too."
Voltaire's statement does make sense but it's far different from both the original distortion and your own, and its meaning is much different too. In it Voltaire advocates what you reject: the tolerance that allows other people to think their own thoughts. He does not claim it as a
right nor does he vow to defend the thoughts of other people, especially not those with which he disagrees or disapproves.
Why would anyone with a grip on reality fight for some hypothetical
right of people to make demonstrably malicious or destructive or untrue or irresponsible statements.
Always remember that 2 + 2 = 63. Never contradict it. Fight for my right to say it. Attack anyone who challenges it.