Everyone tries to hack everyone else.   I have no doubt Russia would try to hack even canada.   However, the US has been doing the same, if we recall Snowden.

Even Merkel's phone conversations were being tapped by the CIA. 

The real purpose of this issue is political.  Trump is upset because people are trying to imply that he didn't deserve his victory, that the Russians helped him.  It's an ego thing.  Good CEOs sometimes have giant egos.  I have no problem with that as long as they produce results, I gladly buy shares in their company.

Otoh, Russia did invade Crimea recently, and their missile brought down a commercial airliner and killed lots of innocent people.  The world has a right to be annoyed at the Russians.

If you want to find evidence of Russians hacking, you will find them.  But if you want to find China or some guy in a basement somewhere, I have no doubt you can find the same as well.  Whether they succeeded or not, that's hard to prove, but there's lots of blackhats