Every message is meant for an average user because the number of average user is the highest. I don't get scared by someone's Bitcoin wallet getting hacked or coins going through a mixer but you have to keep in mind an average user. Average user likes service that forgives them mistakes, they like PayPal because they can claim a refund if something goes wrong, if they accidentally pay money to someone. They like bank because they can call to bank and reset their login and password credentials if something goes wrong and they can regain access to their account. Bitcoin is too much of a responsibility for an average user.
I completely agree with what you said—I also believe that cryptocurrencies encourage individuals to take on responsibilities that are often handled by other institutions. But in this case, the sample of an average mixer user won't be equal to the sample of an average user in general, since using a mixer requires at least some understanding of cryptocurrencies. And because of that, the person is already, to some extent, assuming the kind of responsibility you're talking about.