Macbeth Act 4
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Macbeth does not achieve much other than showing himself to be a bloodthirsty tyrant and giving Macduff a reason to cut off his head. The slaughter shows the extent of Macbeth's paranoia and disregard for life. By this point in the play Macbeth has bought his one-way ticket to being a complete sociopath. There is no turning back for Macbeth.
I am in blood/Stepp'd in so far that, should I wade no more,/Returning were as tedious as go o'er.