The point wasn't about what type of car crashed. Mustangs are just as vulnerable to crashes as any other type of vehicle. So the Mustang connects to this video based on the fact that it's a car.
And yes God knows our time, but we don't. So there's no reason to do anything to increase the odds, right?

You wouldn't put a gun to your head and say "well only God knows if this is my time"
Not everyone buys a Mustang to go fast. Just ask Gary Paul (member on here). His Mustangs sit in his garage and never get driven. It's a vehicle made to be enjoyed, not always driven like a maniac in an irresponsible manner. There's nothing wrong with going fast as long as you're doing it in a controlled environment (i.e. track) where you don't have the ability to harm innocent people.
And yes you're also right about the other drivers, but what if you end up becoming the "other" driver. Suppose someone else is driving perfectly but you mess up? Then you are the "other guy" that harms an innocent person. It's just better and smarter and wiser to drive responsibly on PUBLIC roads that are used by everyone. If you want to race and drive crazy, take it to the track.
Where does the Mustang connection come in? A semi can also hit you even if you are driving normally, a drunk driver can smash into you, only GOD knows when it's your time, we all buy Mustangs to go fast, and all of us being adults are very carefull, I personally think it is the OTHER drivers you have to worry about.