First, it takes effort when you're paid a pittance per every article you crank out. The reality is that a lot of newspapers now operate more as content farms (publish a lot of stuff as quickly as possible) than as outlets for investigative journalism.
In fact, for a lot of these clikbaity stories, you could cynically say that the truth just doesn't matter. "Research shows that the kitten was never stranded in the storm drain in the first place." OK, so? How were you harmed by an untruth? Why did you click in the first place?... I can get angry at being lied to on principle, but maybe there's some soul-searching I should do.
Further, we don't actually fact-check the vast majority of what we take to be true. When you're dunking on people for not fact-checking, you're essentially just saying "the things you accept as true differ slightly from the things I accept as true". You're probably not better than that gullible journalist. You just happened to know a bit more about this topic, or had some other arbitrary / subjective reason to investigate this particular thing.