Griffin's scientific genius is undermined by his lawless and selfish character. He misused his invisibility for personal gain rather than humanity's benefit.
Firstly, he set fire to his landlord's house out of pure revenge. Later, he attacked a shopkeeper and robbed him of money. At Iping, he stole from a clergyman's desk and terrorised Mrs Hall's household.
His inability to control his quick temper and criminal instincts turned a brilliant discovery into a tool for destruction. He had no moral responsibility, only self-interest — which made his genius dangerous rather than beneficial.
Source: Footprints Without Feet, Ch. 5
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The examiner expects you to link character flaw + specific examples of wrongdoing. Three marks = three clear points: (1) his lawless nature/revenge against landlord, (2) robbery and violence, (3) conclusion that moral failure destroyed the potential of his genius. Avoid vague statements; cite textbook incidents (fire, shopkeeper attack, clergyman's burglary). The phrase "lawless person" comes directly from the text — use it.