Most people who think the Russians somehow altered the elections say they did so by leaking the DNC Emails to Assange. This kind of influence over a foreign election--exposing corruption--is perfectly ethical. Complaining about this is basically whining. I don't think the Russians did this--they would have blackmailed Clinton instead and Clinton would have agreed to do whatever they wanted in a heartbeat--but if they did, they did us a favor and we should say, "thank you."
The few people who think the Kremlin somehow rigged voting machines do not understand the Electoral College. Say what you will about it's representativeness (although reflecting the Popular Vote was never a stated goal) but the Electoral College makes hard theft of a nationwide election virtually impossible. You see, in a popular vote election, you can pick and choose where you want to dump votes and dump them only in places you have strong influence over. An Electoral College system means you can't pick where you dump your phony votes; you have to put them into battleground states which are likely to be hotly contested and scrutinized. It's hard enough for a political party with hundreds of boots on the ground and people who are intimately familiar with the system and people involved to pull this off. A foreign government doing this with a few dozen foreign operatives and perhaps a few insiders (and I'm being REALLY generous with those numbers) is literally unfathomable.