Griffin was a lawless person, who waslargely disliked by all. When his landlord tried to evict him, he set fire to the house and escaped due to his invisibility.

Introduction:
In the novel "The Invisible Man" by H.G. Wells, the character Griffin is a scientist who becomes invisible through a scientific experiment. As the story progresses, Griffin's actions become increasingly erratic and destructive. One of the most significant acts of destruction committed by Griffin is when he sets his landlord's house on fire.

Reasons behind Griffin setting the landlord on fire:

1. Desperation: Griffin becomes desperate for money to sustain himself and continue his experiments. He realizes that he needs a place to stay and funds to support his research. Being invisible, Griffin finds it challenging to secure a job or earn money legitimately. Frustrated and desperate, he resorts to extreme measures to fulfill his needs.

2. Revenge: Griffin feels a deep sense of anger and betrayal towards his landlord. The landlord discovers Griffin's secret and demands that he vacates the property. This eviction threatens to expose Griffin's invisibility to the world, which he fears would ruin his chances of success. Feeling betrayed and humiliated, Griffin seeks revenge against the landlord for interfering with his plans.

3. Psychological deterioration: As Griffin's invisibility progresses, he becomes increasingly isolated and detached from society. He begins to lose touch with his own humanity and develops a god-like complex. This psychological deterioration leads him to believe that he is above societal norms and can act with impunity. Setting the landlord's house on fire becomes an act of power and control for Griffin, further amplifying his distorted perception of reality.

4. Symbolic destruction: Griffin's act of setting the landlord's house on fire can also be seen as a symbolic representation of his own internal turmoil. The fire represents the chaos and destruction that Griffin has brought upon himself and the world around him. It serves as a manifestation of his own inner conflict and the consequences of his actions.

Conclusion:
Griffin's decision to set his landlord's house on fire is a culmination of his desperation, revenge, psychological deterioration, and symbolic destruction. His actions reflect his deteriorating mental state and his willingness to go to extreme lengths to protect his invisibility and fulfill his own desires. Ultimately, Griffin's destructive behavior leads to disastrous consequences for both himself and those around him.