Assuming no fault is something you want in a lot of places. For example the general rule for all emergency services (that is police, fire brigade etc.) is that unless you deliberately place a fake call, you're generally not held liable. The reasoning is that all emergency services would prefer to be notified earlier rather than later (for example for smoke rather than a full blown fire) and holding the caller liable for false alarms provides a strong incentive against that. So all in all, false alarms are considered something that the community/society needs to bear in return for peoples willingness to help/notify.