Which mindset in particular?
With the hacks mentioned, people might begin to get really confused. Some trusted custodians; their funds were stolen. Some didn't trust custodians and preferred to self-custody; their funds were stolen just the same. Some funds were kept online; they weren't sufficiently secured. Some funds were kept offline; they weren't sufficiently secured, either.
So, which cliché to do away with? Internet must be freed from whom?
Perhaps it's the illusion of being in control. People tend to be complacent with their chosen methods, but the truth is that there's no perfect way to secure your coins. There will always be vulnerabilities and risks associated with any setup, and the human factor is always the weakest link.
Real problem is they think that having a key is enough, but the problem is they are actually still exposed for exploits and other issues.
So even if there's no methods could guarantee them 100% protection, still they could do something like setting up multiple safeguard to lessen their chance to hit by an exploit.
Better aim doing things that can enhance their safety and don't join with wrong opinions, because that might give them a painful lesson which for sure they don't want to experience.