I'm still waiting for not even proof, just allegations, of what they hacked because as of now, all I've heard is that they "hacked" the election. Like what does that mean? What specifically did they actually hack. This whole hacking thing just seems like the dems grasping at straws to make things as difficult as possible for republicans to do what they want to do.
"Hacking the election" is just an attempt to delegitimize the results. The actual hacking was of the communications of one of Clinton's top aides, John Podesta, and of the DNC's server, and then the publishing of some of this information on Wikileaks, and elsewhere if memory serves. Included in some of what was published were disparaging remarks Podesta made regarding Catholics/aspects of Catholicism. Hacking attempts were also made on the RNC, but were either less determined or met stiffer defenses, and don't seem to have succeeded. Speculated motives range from affecting the results of the election by swaying public opinion to having leverage against Clinton during her expected presidency to delegitimizing the election to any number of things.
To me it seems probable to definite that the Kremlin was behind the hacks. Whether the Obama's response is merited or not I can't say as I haven't looked into historical precedents (if they indeed exist). What is unfortunate is that Obama's actions are more than likely politically motivated, and even if they weren't they'd be looked on as such.