You haven't been here as long as I've been here obviously. Everyone pre-2010 said that Blockland couldn't be hacked.
So because everyone said Blockland couldn't be hacked, it means it's true? Sure, there were a few valid points that some people made about certain aspects of Blockland being secure but that certainly doesn't mean that you can't hack it altogether.
You have to keep in mind that most of the people who made / make those claim not only lack the reading comprehension skills to gather that just because some aspects of Blockland of Blockland can't be exploited doesn't mean that the whole game is 100% secure, and have little to no programming knowledge.