Like @Forever Sleep said, its not the process of dying that gives it any meaning, it's the context how it affected the people left behind. For the firefighter example, the meaning of their death is acknowledged by the people they saves, same as the first responders, etc.
For people who want to CTB, we often attach meaning to it. We want it to mean peace, or at the very least, a relief to suffering, even though we don't really know. All we think we're sure of at this point is that something else is better that what currently is.