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>It is incredibly unlikely that a bacterial infection from tap water

It's not bacterial, it's amoebic.

I think you're being unduly skeptical and I can't find a reason beyond your own intuition, which doesn't really hold much weight against first hand accounts from individuals and trusted news sources without any clear bias or motivation to be misleading.

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I'm not skeptical that this problem is correlated with wearing contact lenses, I'm skeptical that this problem is not correlated to wearing them correctly.

My point is: who is more likely to get an infection? The people that sterilize their cuts and scrapes, or the people that don't? Same thing here: for such a tiny subset of total contact wearers, it's unlikely that it has nothing to do with your lens hygiene. I doubt any one of the 125 AK sufferers in the UK were following recommended lens care/application to the letter. That does not seem unduly skeptical to me.

I'm no kind of expert, but I know the infamous "brain-eating amoeba" (https://en.wikipedia.org/wiki/Naegleria_fowleri) can kill in days. It seems like a lot of things have to go wrong at once to get an amoebic infection, but once you do they're really, really nasty.

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