I'll grant you that point as technically correct...but... Those were obviously believable and had confirmation from other nations. NK went nuclear under Bush. Iran got their technology from Russia.
Now, all we have is anonymous sources and no proof. There is quite a distinct difference.
Besides, prior actions have no bearing on the question at hand. The issue is specific and unique.
Obviously believable? Come on.
NK hacked Sony in response to a movie that ridiculed their Fearless Leader. We responded. No one asked for proof. Iran was working on nuclear enrichment. No named sources there. No one asked for proof. While not openly admitting it - we hacked them with stuxnet. No one asked for proof or named sources. Named sources almost NEVER emerge in intelligence like that. The best you get in an ongoing event is the intelligence agencies speaking.
Consider this.
Russia IS suffering under the sanctions imposed by Obama and Clinton as SOS, in response to their actions in Crimea and Ukraine. It's have an economic impact that's particularly felt given the crash in oil prices. Putin wants the sanctions lifted. He's also angry at Obama and Clinton over this. Did he INTEND to affect the election? Or did he INTEND to just disrupt things and cause mischief? Either is possible. Follow the money and follow who benefits: a Trump victory benefits Putin because it offers a better chance of getting sanctions lifted than a Clinton victory. Only the DNC was hacked and emails weren't just dumped on mass but strategically dumped to affect ONLY Clinton. Why isn't it obviously believable that Russia was involved? You have a potential benefit to Russia (at absolutely no cost); you have all of our intelligence agencies in a rare agreement, and you have a pretty darn good reason for Russia to be behind this - sanctions imposed by Obama & Clinton.
But only now is a higher standard of "proof" being demanded. Russia is no newcomer to these games - what's new is the ready willingness of some to believe Putin OVER our own government, our own president, our own intelligence agencies, our own congress - and all I can say is WTF y'all?