This is not an issue that the government should get involved in. Period. This is an issue between a private company and whoever hacked their computers. I'm not seeing the big deal here. So what if Sony got hacked? So what if they did or didn't lose money? It's their fricking problem!!! At this point there's no proof that North Korea had anything to do with it and if they did, who cares?!!
Third, can we just get over this ridiculous idea that a hack of one company, which may or may not have been by actors working for a government, is an act of either "terrorism" or "war." It's not. It's a hack. Tons of companies get hacked every day. Some have good security and still get hacked. Some, like Sony, appear to have terrible security and get hacked very easily. It's not terrorism. It's not war. It's a hack. We shouldn't be talking about retaliation or destroying countries over a hack. We should be talking about better security.
LINK:
https://www.techdirt.com/articles/20141221/07453029494/rep-mike-rogers-his-way-out-congress-slams-obama-not-going-to-cyberwar-against-north-korea.shtml