To me I just like the excitement. The local Fire Department here only gets about 300 or so calls a year maybe 10 of which are actual fires, the rest are just medical. As cop you'll get a lot more...
Probably because they arent. Don't get me wrong, they're some of the best, but the SAS hasn't done anything worth mentioning since Delta Force and DEVGRU were formed and took over as number 1 and 2...