I have been to downtown Detroit a number of times but they were always during daylight. Mostly for Tigers games. The last time was a few years ago for the Auto show and that would be right at about this time of year. Its always a bit dicey when you are in an unfamiliar place but I didn't get any major bad vibes. Granted on these occasions I was like you for your dance thing part of a large crowd so it might be different if you are by your lonesome or perhaps at night which the Super Bowl will certainly be.
I agree with you.
When it's light and a big crowd, one is safe.
Alone and at night, you better have a CCW.