"Contemporary fads"? OK.
I'll just come take your kid hostage. With no "secular laws" to stop me, you're outta luck.
No secular "law" has ever stopped a hostage situation. If you were to hypothetically attempt to take my child hostage, I wouldn't cite a secular law to stop you. I'd just stop you. Permanently. Just as I wouldn't hesitate to engage in an armed revolt against the world were the world to militantly turn on the papacy.
"I'll just come take your kid hostage. With no "secular laws" to stop me, you're outta luck."
I would be pleased in the knowledge he would be hugged to death and overdosed on wine and cookies. He could hide under your cavernous skirts like the poor ignorant waif in Dickens' Christmas Carol.