You guys agree or what?
You misunderstand. There is an explanation here.
https://bitcointalk.org/index.php?topic=458386.0Well although the problem was known before, nobody exploited it on a large scale until now. And why now?
Because Mt.Gox put it in the spotlight. I doubt more than a handful of people were aware of this before.
Because MtGox said they would not allow withdrawals until the
issue non-issue was fixed. They dug a hole and this is their way of forcing a fix so they can get out of it.