What?! Ironic coming from anyone that used to be at Colgan IMO.
GA is as safe as you'd like it to be. Me? I'd fly GA but haven't had a chance now with a baby. I don't know the specifics of this crash, but if it's a structural failure, I don't think the PA44 has a history of structural failures. Investigation still pending, but two young pilots on a cross country time building flight sounds like someone tried to bend the boundaries of flight a little too much.
If you're afraid of collisions get a plane with a traffic alert system. We have plenty of those in the NYC metro area. I don't know where you are but the more rural the location, the more rare the GA planes.
As for redundancies, true, but they are only as good as the pilots flying the planes. For example, if someone improperly rigs your trim, and you forgot to do the first flight of day trim checks, then yes you will crash right after takeoff .
GA got you to where you are today. Why fear it? Just make good ADMs as you go. For me, I won't go IMC in a typical Cessna six pack simply because I haven't done that in years and am now used to glass layouts. But a nice VFR day? It would be great!