You make an excellent point, one I didn't think of. One of the issues that puzzles me about the condo dwellers is that odds are, NONE of them are going to be much aware of the firehouse UNLESS they are subjected to the siren noise. Condo and apartment dwellers almost never do anything outside their abodes, they don't have yard care, landscaping, snow removal, etc. They cannot wash their cars in the driveways, don't have to maintain the property in any way, etc. I am VERY sure that an arrangement can be made between the authorities and the condo dwellers that the sirens on the equipment will not be used until the trucks are on the main street. So...what is their complaint?
I've observed that the closer you pack people together, the less they want to have anything to do with each other. I can understand, and relate to that, to a certain extent. That reality is part of why many of us choose to live rural.
Condo living, with it's physically insular/isolated lifestyle tends to reinforce that thinking. Fire doesn't respect those perceived boundaries though - modern building code, correctly implemented, will limit fire spread much more so than in old high density construction - but you are still going to get plenty of collateral damage from even a small fire in high density construction.
I know from a contractor friend who has seen the aftermath of just a major water pipe breaking in a high rise (no fire). Major $'s involved.
Came across an interesting book that talks about the issue of modern, supposedly educated people that live in high density cities, and some of the really basic things they have lost for knowledge. Or, as a good friend of mine puts it "They are so smart, they're stupid".
As with the jail example above, it doesn't take much of an additional delay, to create a much bigger hazard. Insurance companies know this, and price accordingly.
Rgds, D.