As much as I dislike this president and get a constant headache trying to keep up with this collusion investigation, at the end of the day unless actual voting stations were hacked into and votes were changed or dead americans somehow casted votes black sheep style how can we really say the russians handed him the election? I was mad she lost but if freewill by voters is what took place then I have to accept that which hurts. I would dare to say comey is a big reason she lost with him announcing close to the election he was reopening his investigation into her.
Others have already said it well. Misinformation or not, it was a legal vote. Given Hillary lost by 80,000 votes, it may have made the difference, who knows. Also, as you say, getting info on an opponent isn't illegal in, and of itself.
The problem is how Trump did it. There are laws in place he potentially broke. Did he have a connection to the DNC hack, or the info received from it? Did he violate campaign finance laws? Did several of his staff members meet with members of the Russian government? Did he promise them anything, off the books? Is he being blackmailed? Did he funnel campaign contributions? There are a lot more potential illegal acts beyond those as well.
I think it's important to uphold the law. Especially at the highest levels where real harm can be done. Knowing whether the most powerful man in our country is compromised is important enough to investigate.
That, plus the investigation started out from tips from Australia that Russia was attempting to mess with the election. Trump was pulled into it by his own fault. His children held the meeting in Trump Tower. Held conversations, and text messages with the Russian lawyer. Maybe conversed with the people behind the hack, and Assange himself. He hired Manafort, a known bad guy. Several of his staff met with Russians. Trump also mentioned info about the hack before it became public knowledge, asked Rusia to hack Hillary, and said he gets a lot of money from Russia. It's not as if Trump got pulled into it out of nowhere.