Why Kill Lady Macduff

Bard, you made my blood boil today As I clenched my fists at your fourth act My eyes were furious Inquietude stole over me I've been in this room before, but this time I experienced the brunt My heart turned as cold as a stone Listening to the lovely woman jousting playfully With her beautiful boy I could see her eyes welling with tears, uncertain but adoring Stoic mother bird- for her children Just as the last bits of sand fell like drops of blood The hourglass is done and the lady is plunged into night This blameless, innocent creature and her babes Where will you go, if even your home is not safe? I fell in love with you, with your family, just as he wanted And was effectively heartwrenched when he took you away His glimmering blade, poised like a viper at your throats These sweet little things, a love that cannot be Screaming at the the pages, the play is played Why? Please tell me why? Why does there always have to be a sacrifice?