Not when the consequence of being wrong is somebody else's death. There are plenty of Muslim extremists who are "willing to accept the consequences" of the 3000+ deaths of OTHER people on 9/11. These parents are "willing to accept the consequences" of the helpless young daughter's completely avoidable death. Neither of these positions is defensible via the perpetrators' claiming a right to "true freedom".
When you lose a child it is as if you had died. In fact you would trade places if it were possible. But what gives you the right to say that your values supersede the rights of others. Unless you are personally willing to intercede and take responsibility for the other person. then let the parents handle it.
If they are wrong, ultimately they will be punished. be it in this life, or the next.