Who? Where? I think everyone I've seen discussing this (other than the must-defend-Trumpers) has said that this had an impact. Not that it was the only thing happening in the election. You are reading what you want to read.
I'm not sure what the relevance of this is to the question of whether the US should investigate and punish this type of behavior. The alleged efforts here seem to go well beyond what's happened in the past, no? Don't they indicate a growing danger in the new technology era? Why sweep it under the rug just because Trump is insecure about his win? Finally, again, is your position that Russia spent all of the time and energy on this just for fun? Because they didn't think it would have an impact? You think that they targeted their efforts on certain parts of the country just to try stuff out?
Irrelevant to the legal issue unless, gasp, you are slipping into being a partisan hack. The must-defend-Trumpers can't get it through their heads that some of us care about the integrity of the system more than some stupid political squabble.
Would it help you out if I told you that I thought that she was a terrible candidate who had made many errors? Again, you keep funneling this through your own lens. You presume that this is all about reversing the election. For some, I'm sure it is. But there is enough out there for everyone else to be concerned too. Combine that with Trump's historically weak, and straight dumb performance last week and his ongoing discussions with Putin, and you have to be just absolutely blinded with hatred for the Democrats to not want this pursued.
TLDR: those opposing this are being as hackish as the people who are foaming at their mouths working any theory to upend Trump. Russian efforts here were widespread, illegal, and influenced the election (note that I didn't say "decided" the election). There's nothing to debate there. You can choose to care or to not care.