There's a difference between being right, and being fanatical.
What's being fanatical about being Catholic and believing that life begins at conception and that IVF is wrong and that Catholics in the public square such as Brooke Shields should not be publicly touting a procedure in the news which according to the church kills life, is considered abortion and is a mortal sin? Sad to say people believe and emulate celebrities.
Either intentionally taking an innocent human life is right or it is wrong.
Opposition to the intentional taking of an innocent human life is simply the right position.
Fanaticism has nothing to do with it.