Don't forget, we're dealing with wholesale ignorance on the part of the media.
Having recalled stories from back when the Carrera GT was introduced there weren't many reports that the car was particularly dangerous. This is a track-oriented high end sports car. Most cars in that performance category are challenging to drive near the limits. I do have to admit a caveat; most in the automotive press gush over every new model that comes along, saving criticisms for when the car is well past it's prime. But the fact remains that there are a multitude of performance cars out there that are notorious for being difficult to drive.
Just because a car handles well doesn't mean it does the driving for you. Unfortunately, this is where the vast majority of people display massive ignorance, because they do believe that a car will save you from mistakes and incompetence. And they're convinced that the better it performs the better it will do the job.
The two guys in that Carrera GT were supposed to be more competent than most given that they have race cars. But given that they weren't career racers doesn't mean they were actually competitive, let alone any good at it. There are gentleman races all over the country where rich men bring high priced toys to the track and many show an embarrassing lack of skill.
But let's assume these guys were decent. That still doesn't change the fact that they were on an unpredictable public road, engaged in a dangerous activity. These guys crash all the time at tracks, even when they're good; they aren't pushing hard enough to win if they aren't risking a crash. So take that mentality to the open road and problems ensue. There's a reason why car insurance rates are higher for race car drivers.
All this doesn't consider the possibility that the Carrera GT might have been modified by Paul Walker's shop. I don't think that's particularly relevant, because the stock car was fast enough. But if it were the car would likely have been even more difficult to control.
Unfortunately, we've got all this ridiculous analysis when the reality is actually quite simple. A couple of guys went out for a joyride, wrecked and died. It's no different than when some kid does the same in a Honda Civic.