My point was going more into another direction: We can't rely on the hope that nobody would ever insert illegal data in the blockchain. Because as I wrote there are ways to do this without Taproot or Ordinals. And someone who wants to destroy Bitcoin could use whatever method, even those old methods from 2013 requiring fake addresses and a lot of block space.
In my opinion, we should increase the difficulty of some hack like that and not facilitate it. It's as if you had an insecure front door lock, so as a consequence you remove it completely or leave it as is. Instead of upgrading it, when you realize it has always been very insecure.
I'm also sure that one who really wanted to do it could even insert whatever data in a blockchain without any scripting, like Monero (that's also an answer to @n0nce).
Do you have some proof to back this up if you are 'sure' about the possibility?
One simply would use a combination of addresses, transactions and amounts which would encode [...]
You clearly haven't had a glance at Monero yet. There are no addresses, transactions and amounts viewable to the public. So I doubt your above proof ('I am also sure') highly, just from this misinformation alone.