I don't disagree with what you're saying but I want to point out that it's rather unusual for (American) ambulances to carry blood, and probably more of them should.
https://www.redcross.org/about-us/news-and-events/news/10-wa...
https://www.redcross.org/about-us/news-and-events/news/10-wa...
Email is username at kylehuey.com.