The scenario gets even better when you start thinking about what kind of facility is getting hit. I'm not even talking about some high tech cyber outfit, or bleeding edge programs. Industrial sites are where you want to pull something like this, and I'll tell you why.
First, industrial sites usually have more of the more 'expendable' types of human resources about, and less of the high end talent or critical data. While this means that security is generally less, you're more likely to have collateral damage that has friends and families in the local gangs. This becomes important later on.
Second, you have big tanks, crates, or other storage mediums of Stuff. The exact nature of the Stuff is up to you, and how badly you want to frag them (and the neighborhood). Chemicals, either toxic or flammable, are the gold standard for this, as it doesn't take much for a kill-happy team to rupture tanks, causing explosions. Even if they don't hit the tanks, the team doing the real run can arrange for tanks to 'accidentally' explode while your team are on site. Basic chemical spills are the standard, as I said, but if you really want to gutpunch them, make it something radioactive, or make it be foodstuffs, like soy factories. Either one of those going up in flames will immediately ratchet up both public awareness and police looking for the 'terrorists'.
Now, how you play this depends on whether this is an internal job or an external one, but the main thrust remains the same. Mr. J approaches the team for a smash and grab, with emphasis on making sure that the facility's production is slowed at least a couple weeks. They're hitting an Ares target, and Mr. J looks Hispanic and speaks with an Aztlaner accent. He doesn't say he's working for the Big A, but, well, he doesn't say he isn't, either. (News flash, he isn't, but the players are meant to think he is.)
Now, after the run there is massive property damage, mass casualties, and a lot of people crying for blood. A 'helpful tip' comes in from one of the local gangs. They want the Knights off their backs, so they mention who they 'conveniently' spotted during the attack, namely your team. Doesn't mean they won't go about trying to find the team themselves, but they aren't about to take heat from Knight Errant for something someone else did, especially if there is a reward for the info. So your team's image gets put up on the screens, since cameras are everywhere, and even gangers have commlinks. And because of the damage, KE is looking to score points on taking the terrorists down.
Now the team has to try and avoid capture by the Knights, attacks from the gangers, and the inevitable reward for fucking up so grandly, a double-cross (maybe even a triple-cross) at the meet, with our suspiciously Aztlan-ish Mr. J attempts to silence the team. For added difficulty, have the Knights crash the party, once more on a 'tip', while Mr. J disappears.
What do you have after all of this? Your runners have learned that getting the rep for being gun-happy has led them into being patsies for a run that's turning into a PR nightmare. Their employers aren't going to pay that second half, and the Knights are broadcasting their faces, saying that they're to blame for causing a city-wide foot shortage. All while Ares starts maneuvers against Aztechnology, while Horizon looks on.