The Birling's have not learnt their lesson, like the upper class after WWI. The second visit of an Inspector is like war coming again - unnecessarily.

Birlings/Gerald are pleased with themselves again- "I'm most grateful". Inspector comes to ask them questions- "telephone rings sharply"

Cyclical structure

We did her in all right.

But there are MILLIONS AND MILLIONS AND MILLIONS of Eva Smiths and John Smiths

It frightens me the way you talk.

Euphemism - for prostitution. The woman is her madam (or pimp).

I was in that state when a chap easily turns nasty.

We don't live alone. We are members of one body. We are responsible for each other.

WWI could be seen as having been a lesson for the upper class about the 'blood and aguish' that would come if they didn't change their ways.

they will be taught it in fire and blood and anguish.

you turned her away - yes, and you killed her