Windows 3.1 had configuration options to let you change the color of the blue screen messages. I dimly recall being told that the critical error message was originally red, but it was changed to blue for readability, as well as to make it less dramatic. My guess is that Windows 3.1 left an escape hatch in case they needed to change the color again.
https://devblogs.microsoft....0220201-00/?p=106209
Less dramatic.