In the BEST of times it creates a severe delay. In many cases, every minute counts. There are life-saving measures where time is of the essence and they cannot be started in an Ambulence.

The most common that comes to mind is a stroke. 5 minutes' difference can be the difference between 99% recovery and a fate far worse even if the patient survives. They literally treat a stroke with different procedures based upon how long since the onset of symptoms. More obviously relevant with any cardiac arrest event, or certain acute trauma like gunshot wounds.

And your example, where people STILL die from the delay, is the best case.

Look, we both agree the climate is important, but would you sacrifice your mother, or spouse, or child for a protest that isn't directly going to improve the climate on its own? Blocking the highway does not make the protest help the climate more, but IT DOES END LIVES. Instead, why don't you block the entrance of an oil power plant?

Honestly, I know why. Because they'll run you over because they're the monsters, so you protest at places that won't. I GET that. But an oil tanker isn't going to be read their last rites in 5 minutes with the bad news told to their families.