Threatconnect did a decent amount of research into the attacks[0] for trying to figure out who did the attacks. There are other security researchers out there who come to similar conclusions.

So either the government is bribing a bunch of security researchers (who doesn't want the scoop that the consensus is wrong?), the government executed a perfect false flag to blame Russia on something (why do this? It's not like having Russia as an enemy is useful for us), the analyses by these researchers are right, or something else.

My money is on a decent amount of smart people all arriving somewhere near the truth.

[0]: https://www.threatconnect.com/blog/guccifer-2-0-dnc-breach/