If you put together ten typical American conservatives and ten typical American progressives in a room, they will all share the same opinions of Mexican drug cartels and ISIS. They would probably differ in their views on what to do about the problem, and on the causes that brought them about, but there would be unanimous, unwavering agreement on the fact that the subjects under discussion are a Bad Thing that we would be better off without. They are not contested topics, and so harping on about how bad one or the other is would be a lot of wasted energy.
On subjects like Trump and Obama, however, their viewpoints would be liable to conflict a lot more; and so these are the ones that require energy to discuss, and that people feel the urge to talk about to reassure each other that people share their views, despite the divergent opinions they're exposed to.
It's not that anybody thinks Obama or Trump are worse than Guzman. It's a question of which are the dividing issues under dispute in your society.
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