A similar thread about WWE "shooting" on TNA was posted last week when one of the Three Stooges came out to "Real American." I'm a pretty big fan of TNA, moreso than WWE for the most part, but it wasn't a shoot last week and it isn't a shoot now.
Why? Because WWE cares very little about what TNA as a company does. Financially, they're not in the same league. They're not the gigantic media conglomerate that WWE has established itself to be (thank God). They don't steal any measurable ratings away from WWE. They don't beat them in PPV, advertising, or merchandising sales. TNA is a pro-wrestling product and that's pretty much it. WWE is a multimedia company whose crown jewel is a sports entertainment product that is based off of traditional pro-wrestling. Big difference.
WWE does in fact care about Jeff Hardy, Kurt Angle, and Hulk Hogan regardless of where they are now or who they work for currently. The reason is that all three have deep histories in WWF/E, were established names in WWF/E at one time and were all guys that Brock Lesnar beat up. Why not feature Brocks victories over guys like Rock and the Undertaker more prominently instead? Well, why make boys on your existing roster look weaker when you can use guys who don't wrestle for you anymore that still have decent name recognition and accomplish the same task?
The logic goes... Hardy, Angle, and particularly Hogan were big names in WWE. Outside of the company, WWE doesn't really care what they do. If any of the three of them returned, they'd be treated with a level of fanfare like they didn't miss a beat. See Brock, Rock, Flair, and others for proof.
The WWE Universe truly is this entity that exists within itself. Actually, other than when WCW was giving the company real competition, that's how WWF/E has always been really.