That's like saying you can get to zero by choosing the line climbing away from zero the slowest.
Relative Left is not the same as Absolute Left and it will never be actually move to the Left if the thing it's relative to keeps going even more to the Right.
This is why one of the most worrisome thing in the current Democrats is that their electoral strategy is almost purely one of relativism - they almost entirely stopped selling themselves on the good of the things they do and pretty much only sell themselves relatively to Trump.
A "not as bad as the other guys" strategy is not the same as wanting to be the "good guys".