Irony:
Nice connection, but again it's how you look at things.
For instance in 2013 Germany had > 3500 traffic death. So while these gunman attacks are bad and shouldn't happen I find that the atmosphere of fear and doom that is created around them is out of proportion with the number of casualties by this cause. The US had about 34.000 traffic death in 2013. So what creates a bigger doom I ask myself? All these traffic death are senseless as well and many could be prevented if people would be a bit more patient in traffic, follow the rules, didn't drive under the influence and basically be a bit more careful. And while there are programs working on that the amount of communication and public outrage/fear over these death are much less then the outrage and fear over criminal and/or terrorist killings, while the numbers are orders of magnitude higher.
While I believe it would be a good thing that the US would do more to make getting guns (especially for nutters and criminals) a bit harder and better controlled I also agree that gun control is not the solution to the problems. There's too many illegal guns and other means (bombs, trucks, ....) for criminals and terrorists to create the havoc they are after. I agree with Bart that the root cause of all this is deeper.
I don't think they have found the motivation of the gunman (or men) in Germany yet, but I find it remarkable that it's happening on the 5th anniversary of the Anders Breivik massacre in Norway. I wouldn't be surprised if the shooting in München didn't come from the minds of ISIS, but from the minds of an ultra right wing extremist. We'll see how it develops and what new information about this will become available over the coming days.
EDIT: just found a newspaper article saying that the gunman was an 18 year old German born man with Iranian roots. So my conclusion above was premature