From M-W online dictionary
Main Entry: neg·li·gent
Pronunciation: \-jənt\
Function: adjective
Etymology: Middle English, from Anglo-French & Latin; Anglo-French, from Latin neglegent-, neglegens, present participle of neglegere
Date: 14th century
1 a: marked by or given to neglect especially habitually or culpably b: failing to exercise the care expected of a reasonably prudent person in like circumstances
2: marked by a carelessly easy manner
Main Entry: ac·ci·dent
Pronunciation: \ˈak-sə-dənt, -ˌdent; ˈaks-dənt\
Function: noun
Etymology: Middle English, from Middle French, from Latin accident-, accidens nonessential quality, chance, from present participle of accidere to happen, from ad- + cadere to fall — more at chance
Date: 14th century
1 a: an unforeseen and unplanned event or circumstance b: lack of intention or necessity : chance <met by accident rather than by design>
2 a: an unfortunate event resulting especially from carelessness or ignorance b: an unexpected and medically important bodily event especially when injurious <a cerebrovascular accident> c: an unexpected happening causing loss or injury which is not due to any fault or misconduct on the part of the person injured but for which legal relief may be sought d—used euphemistically to refer to an involuntary act or instance of urination or defecation
3: a nonessential property or quality of an entity or circumstance <the accident of nationality>
Either definition seems to work. Negligent just does a better job in assigning the responsibility that comes with getting a BANG rather than a click.