I don't know that I'd lay the blame at retail traders not being sophisticated enough to understand this. I'd lay the blame with the company that had such poor risk controls that they allowed this to happen in the first place.
I'm not sure how you got the impression that the parent comment was laying the blame on the user. I interpreted it as excusing the behavior of robinhood. Blame isn't a zero sum game, it's possible to argue that robinhood is less blameworthy without saying that the retail traders are to blame.
>I'd lay the blame with the company that had such poor risk controls that they allowed this to happen in the first place.
What risk controls? As per the parent comment, it's an issue with settlement/collateral requirements, and robinhood not being prepared to satisfy them in light of a stock going 10x in a short period of time. I'm not sure how "risk controls" would have helped.
They probably didn't do this because they underestimated the need for it (poor risk models), or simply didn't want to pay the extra cost.
They had an opportunity to rail at the system and cast themselves as the vanguard and champion of their users's rights. They were doing everything they could to cover the collateral obligations, but the big bad clearing houses and various market makers were dead set at dousing a bit of water on the fire. Instead they kept to the line, "There is no liquidity problem", which was a bald faced lie to protect against a run and/or loss of faith as you point out.
If there was any lesson to take from GME/meme stocks, "lack of faith" due to poor fundamentals is not a problem haha. Users would have LOVED Robinhood more if they perceived them as helping them fight "the power". But they chose not to and anecdotally any of my friends that were caught up cooled considerably on Robinhood, I don't know a single of my dozen or so acquaintances still using it fearing that Robinhood will fail them when it is critical.