What was the point?

Simple things, simple thoughts.  And every once in awhile some mad men loom unknown, unseen, this time unnoticed to simple Marathon Participants, this one held yearly in Boston, MA., aka: The Boston Marathon.
My niece and nephew have participated in races or competitions similar to this but here in the Midwest, and this week some small measure of happiness for their locale.
The madmen set a couple of home made bombs in hidden places along the Marathon Route, what's your point, what is your point?  When the bombs went off they kill several people, and they maimed over 170 people, now multiply that by all the friends and families affected. And gently add all the people and their families that have ever participated in any Marathons or even any sporting events, and you might be able to see where people everywhere were shocked by the event.  And all of us ask ourselves "what would be the point of harming so many people who were simply participating in a marathon?"
On the scene there were people helping people, hero's of sorts who helped another in spite of not knowing if more bombs would go off, and end up injuring themselves, hung in there to make a bad thing a little better by their care.
And a huge investigation took place, potential suspects have been found, the people of the land rally this, and I understand their thoughts and feelings, no one likes to think of unknown evil lurking in their background, they feel better if they can see the evil.
And sometimes for me, all of dark things that occur out there, especially the crimes against other people who were simply going through their own day innocently, well these events still just make me ask "What was your point in doing this?"