I've been consistent since 2016 on these points:
1. We have no idea if Russian interference was substantial enough to change the outcome of any elections.
2. Even if it was, that doesn't make the results invalid. A legal voter's vote still counts, even if their choice was driven by susceptibility to foreign misinformation.
So let's stay away from this straw man. Having citizens targeted by foreign governments, and believing the disinformation that is sent there way, is a dangerous situation, regardless of any elections.