Since we're dealing with a woman who doesn't believe in taking any sort of precaution because they aren't guaranteed to work exactly one hundred percent, she looks at something we would see as being preventable and insists that it isn't. In her mind, she's absolved from blame because April and that stream were destined to collide and no lock in the world could have prevented it. It is thus with Farley getting sick because he ate garbage; he was meant to suffer because Elly can't prevent things.
What makes this sort of thing all the more annoying is that people are willing to believe her. Most, if not all, of the people on Coffee Talk who cry when Farley died don't burn with the anger that they should be feeling about the imbeciles whose witlessness caused his death. They're more inclined to blame April for opening the gate than Elly for shrugging and thinking that since locks can fail, she only had to say something vague and not have to do anything else.