By looking convincing enough to be selling good shit and not bad shit; then by playing to their biases well enough for them to try and get something out of the exchange. Idealism, i.e. not doing this because of selling anything, immediately disqualifies.
Is that anything approaching reason? Hardly. It's just how folks are taught to be persuaded. You could also frame it as a food quality issue.
Now, am I wrong to expect a better standard out of people - or am I wrong to permit underhanded approaches for the sake of getting my meme out? According to some authors, that's an irreconcilable moral dilemma for each to battle alone throughout their lives... Scratch that, though, here's what.
Considering many more people watch the ball games than the lawmaking debates, what is it that sets the baseline societal standard for convincing persuasion?Examples of acts of convincing persuasion displayed to the general public by the devices of mass communication. (And it matters very little, to our learning ape-minds, whether the image of the convincing persuader is framed as "news" or a "movie".)
What is the use of mass communication, then? A broadcasting device brings (a subset of) some Narrative - i.e. some network of meanings that people attribute to the world around them - into the life of each individual recipient, for the purpose of influencing that life.
Now, the device is working; we are shown things on the hellboxes and we reckon with the ideas which the things mean. Given the activity of mass communication is cheap and ubiquitous, and the resulting "culture soup", in which we grow up immersed, is very much non-optional to the individual, and also very much non-malleable by the individual.
So we have these 2 registers of mass communication, "news" to show "what is normal to happen" and "art" to show "what is permissible to conceptualize", which are broadcast to us obligatorily and in unclear proportions, and that rather bizarre datastream is what defines us as "humanity" and "society" to ourselves, and serves as a sort of civilizational baseline outside of any individual's personal life, studied disciplines, etc.
However, funny business with the artifacts underlying this system of organization: (1) the construction of the broadcasting devices; and (2) the construction of those narratives which seem to almost have transcendent powers over everyone affected... what's in that stuff, anyway? Oops, you're not allowed to know - it's a trade secret!
Wait a second, so the stuff which directly teaches me how I will interpret my life and that of others, is a trade secret? Explain to me that we are living in a democracy again?
When the sources from which you learn, and the contents of what you learn, are someone's property, it means that the knowledge in your head is someone's property, which means that becoming fluent in someone's intellectual property makes (part of) you their property.
...I guess those could be the rudiments of a more orderly sort of argument?