What are These "Lone Wolves" Trying To Prove?

As the #7 train I was on this morning approached Grand Central Station at about 7:30 the conductor announced that the train will skip the Times Square Station since there was police activity there.  I decided to get off the train at 5th Avenue and take the B, D, or F train one station to 6th Avenue and 34th Street and walk over to Penn Station.  I was able to accomplish that with a minimal delay.

I didn't realize what happened until a little later when an announcement popped up on my cell phone stating that there was a bombing near the Port Authority Bus Terminal.  I found out that there was a terrorist with a pipe bomb in the corridor connecting the Times Square Subway station with 8th Avenue and 42nd Street.  Fortunately only the terrorist suffered significant injuries.

It seems that most of these terrorist attacks recently were done by "lone wolves" who claim loyalty to ISIS.  Why must innocent people suffer?  What are these creeps trying to prove?  You just can't have a police officer guarding every square inch of the city.

On the way home there was much more police stationed at Newark Penn Station, New York Penn Station, and the Flushing subway station.  They are guarding against a "me too" attack.  But, how long can they stay there?

What is this world coming to?