https://legaloverview.com/is-it-illegal-to-drive-with-hazards-on/

Here's a article about the differences, goes into detail about Texas

Texas law enforcement generally takes a common-sense approach to hazard enforcement. Officers focus on genuinely dangerous driving, not technical violations of hazard rules... Texas gives drivers wide latitude on hazard use, but using them without any valid safety reason can still draw attention.

I am fairly certain a person bleeding to death would be a common-sense usage due to driving well above the speed limit to get help.

My comment was snarky because, as you said, people in the states don't use them for anything but parking illegally and many don't know what it's for. I have had to explain what it's for to people decades older. Again from the article:

State laws use various terms including “hazard warning lights,” “emergency flashers,” “four-way flashers,” and simply “flashers.”

I was raised on Emergency Flashers, you obviously weren't, and thats fine, but don't try talking me down because you think you're right without checking first. Lots of people coming in here with an unlinked story that, tbh, sounds extremely far fetched to justify someone not switching lanes as fast as the person most certainly speeding wants gets on my nerves real quick.