??? A religion that believes a sweaty Galilean carpenter covered in spittle and blood and nailed to a tree ... is God Almighty in human form, may be many things, but "reasonable" is not one of them.
The argument that the Jesus in the Host would never let Himself be desecrated sounds a lot like the argument that Jesus, if he were really God, would never let himself be killed on the cross.
Do you believe that Jesus could not have called ten thousand angels to release Him from the cross if it was His will for them to do so? He gave His life willingly in sacrifice for all our sins. He DID let Himself be killed. Jesus said:
No one has taken it away from Me, but I lay it down on My own initiative. I have authority to lay it down, and I have authority to take it up again. This commandment I received from My Father. (John 10:18)
The other point is that Jesus is now glorified at the right hand of the Father and there is no need for Him to be "desecrated" nor ever sacrificed again - illegitimately or otherwise. The request to be reasonable is simply to belay the hysteria some Catholics exhibit over the very idea that Jesus could be spitefully desecrated through the use of a "Jesus-containing" consecrated host. That's JUST the reaction Christian-hating Satanists delight in! Don't give it to them.