Suffice to say, the thread is becoming filled with more misinformation and some of them don't understand what they're talking about. OP, you'll be better off trying to search about the forum than to continue in this thread.
Yep. OP, the posts by hosseinimr93 and ranochigo are pretty much on point and should explain why hacking the entirety of the Bitcoin network in its current state is practically impossible. At least from a high level perspective without getting too much into detail. I'm afraid most of the other posts you can safely ignore.
Keep in mind that in a way you can look at the Bitcoin network as holding the worlds largest bug bounty. If there is one system worth attacking, hacking and breaking, then it's Bitcoin. That no one succeeded even more than a decade after its inception tells a lot about the network's level of security.