I’ve donated plenty of times, because it makes sense that there is no other way to save lives than to donate.
On the other hand, I’ve been wondering for years, that while I’ve been told a million times that “blood reserves are low - donate blood now!”, I’ve not ever heard that a single person died due to lack of available blood.
Why would something like that not be reported if you want to motivate people to donate?
My personal guess is that this comes because “lack of avaiable blood donations” isn’t a valid cause of death, the cause of death is whatever else (gun shot wound, knife severed artery / complication during surgery etc), thus it’s hard to pinpoint. Also Doctors may try to “save” blood, when they know little is available, and people may die that may have lived if they had gotten (more) blood, but also they may not have and it is hard to tell.