Eh... you hear about good cops pretty constantly, from what I've seen, actually. It's just local level stuff. County paper, regional news station, that kind of thing, and generally not really about main line profession stuff, but initiatives of other sorts (working with kids, doing fundraisers for whatever, helping organize or escort events, and so on).
Even beyond the psych aspects the media goes nuts trying to gag on, I'd rather think a lot of why you don't hear much about cops that get everyone leaving peacefully after de-escalation and that general thrust of things is because it's, y'know. Their job. Supposed to be basic competence. Ostensibly what they're getting paid for, etc., etc.
When it's seriously out of line stuff -- hostage situations, serial killers, and such -- you hear about cops going above and beyond the call of duty (when things go well anyway). When it's not... you don't. The culture's praise for that is the paycheck and slew of privileges the profession provides, so it's kinda' unsurprising you don't see much explicit praise for what could be crudely put as not shitting the bed. It can be a pretty rough bed to keep from shitting on, at times, but it's still more or less what level of behavior is (or at least should be, given the authority and power they're entrusted with) expected.
S'kinda' like how you generally don't get much news about accountants finishing up that week's accounts receivable, or too much about firefighters that put out the nth house fire where no one got hurt and the fire didn't spread.