Most big blockers are certain that segwit is a catastrophe waiting to happen, for various reasons. That's why they believe buttcoin cash will be the winning fork.
I doubt that if they have any kind of technical knowledge or any kind of genuine attempt to grapple with the facts and the logic that they real are going to genuinely arrive at such nonsensical and ill-supported conclusions. In other words, "most" of these nutjobs are really being disingenuous because they have a hidden agenda (which might not be so hidden for some of them), and that is to attempt to change bitcoin's governance in order to make it easier to make changes to bitcoin.... which is also a fucked up and ill-thought out motive - because they should realize by now that making changes difficult for bitcoin is a feature and not a bug, so their ongoing attempts at making changes easier (for the "competitive" sake of bitcoin), is not really helping bitcoin, but instead an ongoing and persistent attempt to weaken the power of bitcoin's decentralization, security and transaction record keeping immutability.