How is disturbing behavior portrayed?

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How is disturbing behavior portrayed?

The poems Stealing, Hitcher, The Laboratory and My last Duchess all give us indications of disturbing behaviour from the personas in the poem. Hitcher, the laboratory and my last duchess have themes of violence and death, whereas stealing gives us an insight into the mind of a kleptomaniac. These themes, along with the language and structure give us an insight into the poets feeling and thoughts at the time, of different disturbing behaviour given off by people.

Stealing is about a person who remembers stealing a snowman, just because he knew "children would cry" it goes on to tell us of other things that they stole just because they said " I was so bored I could eat myself "I think this poem portrays a strong sense of disturbing behaviour as the persona cares more for inanimate objects he steals, rather than the people he affects, trying only to justify his actions with the phrase "life's tough". He obviously cares only for fulfilling his own compulsion and nothing about others.

In contrast, the other three poems tell us of murder. Hitcher is about the cold blooded murder of a hitch hiker, which