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By increasing the size of OP_RETURN, we enable criminals to insert illegal data
The premise of that line of thinking in Vlad's thread is false from the start. Changing the default policy in Bitcoin Core isn't "enabling" any new behavior, it simply makes the existing behavior (via modified -datacarrier settings or custom clients like Libre Relay) standard so that users of larger OP_RETURNs can expect timely confirmations, which are required by some L2 designs.
For the people worried about the legal implications of relaying illegal images embedded in transactions, are you also worried about relaying transactions from US government sanctioned addresses?
No, but if this does become a legal issue, then it has broader implications than just bitcoin. Everyone running a box on the internet that other people's bitcoin data packets flow through could be implicated. INAL but this is probably already protected under the law somehow, since people have been using the internet to do crime since forever.