Why might shakespeare have decided to show the murder of lady mac diff and her children on stage

He probably did that because showing the murder would move the plot forward, and seeing it instead of being told about it would potentially have more of an impact on the audience.

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.  

the answer to number one is b the answer to number to is a

b. b. b. is the anoswer