German Attitude Towards Window Screens

The German attitude towards window screens is to not use them.  How do I know this?  Because every night I watch my two cats play with all the moths that make their way into our apartment through the open windows sans screens, live entertainment every night.   I asked J.P. about this and he says window screens aren’t necessary  because there aren't so many bugs in Germany and judging by the number of houses without window screens, I would say he’s not alone in his German attitude.  Judging from all the mosquito bites on my arms and legs though I would beg to differ.   

Yet every night, when I'm getting ready for bed, he says "Close the window, before you turn the light on, so all the bugs don't get in."  Mmmm... this is one part of the German attitude that I don't understand but  it appears to be the general German attitude towards window screens.   Don't let the bed bugs bite takes on new meaning in Germany.   

For more on German Attitude see:  German Attitude Towards Fans and German Attitude Towards Encouragement