Fault is not an issue. However, more cases are possible under a rule of strict liability than under a rule of negligence. Negligence requires proof of harm, cause, and fault. However, fewer cases are possible under a rule of negligence than under a rule of strict liability. The upshot is that the tradeoff between negligence and strict liability leaves it unclear to as to which rule results in lower administrative costs.
Wholesale rules are simple and broad.
However, they distort the relationship between marginal costs and marginal benefits of precaution by treating entities and situations that are inherently different as being essentially the same. Thus, they reduce administrative costs but at the expense of creating incentives for people to take inefficient levels of precaution in many instances.