Somewhere in the troll's post, is part of the answer on WHY anyone who can afford a 51% attack will never dare actually do it.
A potential attacker would need to act economically irrationally to successfully launch a 51% attack, when only looking at the attack in terms of bitcoin.
This means that bitcoin, or crypto in general would need to be an immediate threat to whoever is launching the attack. I don't see bitcoin being this much of a threat to any entity with the resources to pull off a 51% attack.