There are many reasons for religious liberty being insanity, and Catholicism absolutely necessarily being the religion of the state and the religion all are encouraged to – for the sake of their immortal soul and eternity!
After you die, you go to Heaven or Hell – everyone in both places is effectively Catholic in that, Catholicism is reality. The world in this life is effectively Catholic too – It is the one true religion, there is no other.
So Catholicism is the one religion of acknowledgement of reality.
Just as we would call someone who said 2+2=5 mad, so to is it madness to say people are free to choose 2+2=5. While one cannot generally -force- people to understand something against their own bad will, that does not take away from the fact that to -not understand- that Catholicism is the true religion is always deeply flawed in some way, a kind of insanity – all the more especially since the laws of the Faith are written in the heart of every man by God, and man is constantly prompted by God in the conscience to come to this knowledge.
Is it not a kind of insanity to choose Hell instead of God?
So, to choose another religion is to choose a false reality – insanity. To pretend all religions are equal is to choose insanity. To treat all religions on an equal basis – insanity. Only one religion is of God.
Religious liberty is another name for liberty to sin.
Of course one cannot use immoral means to bring people to true religion, so in that sense there is liberty – but in most other senses of the idea there is not.
‘Heresy is from the Greek word meaning “choice”. . . But we are not permitted to believe whatever we choose, nor to choose whatever someone else has believed. We have the Apostles of God as authorities, who did not. . . choose what they would believe but faithfully transmitted the teachings of Christ. So, even if an angel from heaven should preach otherwise, he shall be called anathema.’
St. Isidore of Seville