[roenxi]

What is being identified here isn't bias though. You're picking up style, target audience and how blatant it is.

Eg, "Highland Park gunman's family was in turmoil for years before shooting" isn't neutral, it is narrative building. It isn't relevant to anything important - there are lots of families in turmoil out there. Most families, I suspect, face some sort of turmoil every few years. But the style is more high-brow and their clearly targeting people who are/want to be emotionally sensitive.

Bias is different from whether the headline is pitching at high- or low- class audiences. You're probably picking up that Fox news isn't written with people like you in mind and CNN might be.