I don't think anyone in this day and age, can claim to be unaware that Hot Car deaths are a "thing" that does happen.
No adult I know of is not "educated" about the danger of forgetting a kid (or a pet) in a hot car.
The real danger is in the belief of those that feel it will never happen to them.
Well sort of. I do think there's a reason Ray Ray's parents are campaigning for hospitals to educate parents about the danger, while in the hospital, as they do other issues.
People hear about these cases and think, "These are terrible parents. I would never and could never do that." Without being educated that it can happen to the best of parents and being educated on implementing safeguards like alarms or daycare call policies, that attitude can be catastrophic. They don't feel they need to implement such measures because only bad parents who don't care about their kids allow this to happen.