Just wanted to point out though that these issues were chosen precisely BECAUSE most people are NOT apathetic to them.
That's what makes them good wedge issues. For instance, whether the media would cover them or not, people would still want marijuana. (And another set of people would still want marijuana banned.) People care about the issue regardless of whether or not the media covers it.
That's why these are good issues to use if your intent is to destabilize a society. They are latent, un-"dealt with" issues. I'd imagine those are the sort of issues you'd look for when trying to increase discord in target nations.
Is this hypothetical supposed to be something positive? Because I actually agree apathy to these issues, and most others, would be the logical result of not having the media report on them. But climate change happens in the real world, and the phenomenon doesn't care about the press it gets. It would still happen without you being informed. But, quite obviously, not knowing about problems does not seem to be a promising strategy for democratic societies.
(replace climate change with any problem you hold dear and consider true, in case you're one of those people)
Maximised and polarised to the maximum by the media. That is the real common component here. Most people would be apathetic to those issues, if it wasn't for the media bombarding them and pissing them off.