Not offended mate, your not to know about the ugly side of the fire/ems debate, but i encourage you look into it, you may be surprised by what you find.
As for the death thing theres not a lot of info i can give. Your up bringing, family situation, religion, life experiences, personal values and any other variable you will think of will change the way you react to someone else.
What i can tell you is that it is best to understand that you will not "save a life" very often. You will however improve a lot of outcomes and relieve a lot of suffering but you will rarely be in a position where you can "save" a life. One of the issues newbies have with pre-hospital care is this misguided though ultruistic idea that we run around saving lives on a daily basis, and its just not true. They get bored and burned out by the routine, the BS calls, the long hours and distinct lack of "big jobs" to keep interested and leave. Also, you never de-sensitise or de-humanise or seperate yourself psychologically from dealing with the deceased, you learn to understand the fragility of life and what the chances of *you* being able to save one really is.
Another thing is to not expect to be doing massive trauma, this impressive glamourous car smashes on the 6 o'clock news are few and far between for a provider. Sure, youll have runs of them but over a career you wont actually do that many.
As for the smokey thing and being worried about death, i can tell you that as a volunteer smokey not too long ago, i used to wish i could leave with the ambo's instead of babysitting corpses while the police were recovering the deceased, so you will not be less immune as a smokey, in fact there is a chance you will be more exposed as you can neither lessen your exposure to recovery like we can nor as an individual make a large difference to those that are still alive because the real thing we carry that helps people isn't a piece of equipment or machinery, its a Mk1 Brain.
I guarantee that some day you will wish you could have done more for a patient, we all do at some point, some of us will up-skill, some of us will study harder and some of us will leave because we are incapable of doing better. The question i ask you is whether or not you want to help people or help stop houses burning to the gorund, because one of these job's wil directly impact on people and another is focused on protecting property and limiting insurance claims.