"For example, let's say you are a minister who cuts back on the fire provision in a particular region and that results in 1000 more deaths than the previous year.

Should you be held accountable (at least partially) for those deaths?"

Absolutely yes, always asking me, how people (especially politicians) responsible for major mistakes can sleep well.
Just think about this: if a non politician would've made that decision everyone would sue him for everything he posseses+more..