It doesn't stop artbitrary data from being put on chain, it risks freezing utxo's, and worst case scenario, its activation parameters risk SERIOUS reorgs, undermining transaction finality.

In short, it's an attack on Bitcoin.

Founded, no less on "think of the children" rationale (despite, again, NOT preventing anyone from uploading whatever sort of jpg they want. Or tiff, in this case: bitcoin-cli getrawtransaction b8cc570ef453508b6c6a1758bc591c276abdbe2b88881ae487ba4e858bd8d4be | xxd -r -p > luke.tiff