Why wouldn't there be an option to simply quit without saving? Don't you think that is silly?
Go tell that to Starflight, an old space exploration game of the 80's. Designed for systems with minimal amounts of memory, and pathetic CPUs, when you 'created a new game' you actually copied the game onto a new disk. Playing would store some data in memory, and modify the core data files (so once you blew up a planet, it's like it never existed). When you saved, it committed the rest of the memory to disk.
The system meant that, while the game was in-play, certain data (like what artifacts you found, planets you blew up) were current on-disk, but things that were always needed in memory (health of crew, etc) were only current in memory. If you lost power, or ctrl-alt-deleted in panic, there was no way to go back to an earlier save unless you backed up your disks...But even worse, your saved game was now in an inconsistant state and wouldn't even let you reload! Because they needed to save all three of disk space, RAM, and cpu time, the game was impossible to 'quit without saving'. It was roguelike-ish due to technical limitations.
Dwarf Fortress, believe it or not, is similar simply because it IS so huge. If you ctrl-alt-del out of the middle of the game, you wind up with weird things going on like "the goblin squad leader is dead, but he's also walking around the battlefield", and the game starts spitting hairballs everywhere in a few years after you've already overwritten your old backups.
There is no 'quit without saving' because the game saves certain stuff about hist figs all the time, but only commits the whole map to disk when you really save. If you WANT regular backups, you can do them yourself--or you can turn on the 'save every season' option in the init file. It makes a brand new file with that, which you can copy around. You can even make it preserve every single backup it's made (though you have to manage your manual backups manually).
As for your original bug report, that's getting fixed in the next version as part of the enormous squad upgrade! Soldiers in the next version are smart enough to not obsess over their commanders, and can work alone if needed.