Nobody has access to that data, even if you're excluded it to extreme cases like "an at-fault crash happening as the user was manipulating the map software directly". We can't bridge the gap between that and accident reports.
And that doesn't get into the more subtle cases, e.g. a crash that happens later due to an earlier loss of situational awarenesses.
It's also hard to quantify the opposite. E.g. I sometimes have to manipulate the map while driving, and resent the distraction. But afterwards I'm more likely to be in the right lane earlier, not be distracted because I'm trying to read a traffic sign in the 1-2 second window I might have etc.
