I've wondered the same thing for many years.
Oh I disagree very emphatically. Speaking personally first, I certainly consider myself to be sensitive and introspective (and *maybe* even a little creative). And I do have a 'few' musician friends who are political conservatives, one in particular, a former colleague, who is an extremely sensitive person and an extremely talented pianist. And I did know (personally) *one*(!) great concert pianist who was also a conservative, but I do have to admit that 'folks' of this ideology are as scarce as snowmen in Florida in the winter.
I've said many times that if friendships in the music world were dependent on mutual political philosophies, people such as myself would have very few musician friends.

Additionally, two or three of my best internet friends are liberals (and I presume political ones, even though we don't talk politics very much).
As a political conservative, I've often wondered about
You're certainly not off base but I don't know about 'defining' a stereotype. I don't think anyone that I know could be described as 100% liberal or 100% conservative, as I myself am not. But it would be interesting to 'work up' a profile!
Gerrie C