The community needs to adapt the argument to serve the non-tech investors and non-tech crypto enthusiasts more appropriately:

Please take a look at the following arguments:

1. Ah! The very concept of what is legal or illegal can change with time, we shouldn't bother with that anyway!
2. But if DTC stops the permanent uploading to the blockchain, then where will Assange upload the next lot of secret documents?
3. It doesn't matter if some people upload files to the blockchain, if you don't have access to it, why are you worrying?
4. The files are going to be stored via steganography, so the file only exists for one who holds the key to it.
5. Anyone who uploads illegal files and keep the access keys to it would be incredibly stupid.

All of these are NOT good enough. Why?

They demand some sort of faith in the system or believe in a specific paradigm. (1,2,3 and 5) ...or they demand some sort of specific technical knowledge. (4)

Arguments that require some sort of faith in the system, or believe in a paradigm, are entirely useless. Some people will adopt those arguments, but the majority will not, and if the success of DTC is intrinsically related to bringing the masses to the coin, one MUST conclude these are weak arguments that will not help in the long term.

Arguments that require some sort of technical knowledge are GOOD, but ONLY if people are able to understand them. For instance, the very use of the word steganography is going to make loads of people run away from the coin. The argument itself is good, but it needs to be simplified to reach the masses.

I've been working in the advertising industry for 10+ years, and these are techniques that marketers have been successfully using long before that.