Why might shakespeare have decided to show the murder of lady macduff and her children on stage? explain how watching this scene rather than hearing about the event occurring offstage might affect the audience's view of macbeth.

I believe Shakespeare would have shown their deaths because it shows us how a once pure and honorable man became evil and impure. The reason I say this is because he killed Macduff's innocent son and wife who had nothing to do with the mess of him killing the king and the drama going on in Macbeth's home. Most of his actions were due to fear and anger of losing the crown. 
I hope this helps you. 

Something that was made by us humans rather than being found in nature