All media has some sort of bias or agenda. This is pretty clearly an opinion piece, it isn’t as if they are hiding some secret anti-school-shooting agenda.
The biggest lie is whenever someone(s) claim to be "unbiased" or "neutral".
Not all agendas are created equal. Some positions on issues are obviously existential essential: economic inequality, pollution, climate change, legal system reform, policing reform, and healthcare costs. There are many other issues that are lower priority than existential threats that are debatable. And finally there are partisan cause célèbres that largely amount to bikeshedding. It's when those who benefit from espousing a particular issue position deny reality and legitimacy of an existential threat or suffering of a group makes them intellectually dishonest and morally bankrupt.