So if both authors are biased, who is to be believed?
Of course Marc Andreesssen is correct, and of course I am biased

1. Is the author accurate when he describes what would have happened at Target had its customers used bitcoins instead of credit cards?
If Target uses Bitcoin, they use a single wallet, and it gets hacked, it would take a monumental amount of stupidity for this to happen and they deserve any devastation it brings.
2. I had read about that guy who accidentally threw away the wrong hard drive, and he lost $7 or $8 million dollars worth of bitcoins. If it's digital, why can't it be reinstated.
Think bitcoin as a global depository of gold with many locked boxes, he just lost the only key to his deposit box, it just can't be reinstated.
3. With everyone from Google, to Twitter to Target being hacked these days, what's to protect Bitcoin from being hacked? If it's gone, it's gone.
This is not easy to explain in a few sentences. In short, Google, Twitter, and Target have centralized, complex systems, they are big targets and security flaw can pop up in many places; bitcoin network is a distributed system, its security model is very different from the common ones you heard on the news.