> How big? Big enough to disregard?

Yes, pretty much. 400 people are electrocuted in the US every year, usually in industrial situations. Thousands of people will get shocked today. The odds of a heart problem are low enough that suggesting people should be terrified of light sockets because it may stop their heart is just fearmongering, and reduces the effectiveness of other safety-related communication. This is like California proudly proclaiming that everything causes cancer. Counterproductive.

I appreciate the point you’re making, but I’d like a source for

> Thousands of people will get shocked today

Before I come to any conclusions.

According to [0], “There are also at least 30,000 shock incidents per year that are non-fatal” and “ In the United States, there are approximately 1000 deaths per year, as a result of electrical injuries”

So about 1 in 30(ish) if we assume they accounted for nonreporting. If we assume they underreported by 10x, 1/300 is still pretty bad odds

[0] https://www.ncbi.nlm.nih.gov/books/NBK448087/

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That's 30,000 people getting shocked and it being serious, needing to go to the hospital. People doing work around houses get shocked all the time. 120v in typical US house is like mildly annoying. Definitely not trying to hold onto wires with bare hands or anything but getting "bit" while changing light switches or outlets isn't painful enough for many people to worry about finding the breaker box.