“Typically, missionaries are called at the age of 19. Neuroscience has demonstrated that many people of this age have not yet physiologically matured in the brain centers responsible for judgment and discretion.”
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I’d say that 19 year old brains are physically mature enough to know that knocking the head off a statue that is not yours is wrong.
I'd say that the brains of RELIGIOUS MISSIONARIES ought to be mature enough to know that mocking another faith by preaching from the Book of Mormon at a catholic altar is wrong, and not, BTW, really funny. Particularly a missionary from a faith that excludes a goodly number of its own members from entering its own temples for "unworthiness".
There was a thread earlier on the fact that the mormon church doesn't allow poll workers to bring coffee into its building during elections.