Oh, and I think you should tell him that firearms are just too important to you to associate with someone who's so against them, and that you'll be finding a new bass teacher.
This I can't do. Because firearms are not as important to me as is keeping up good relations with the people in my life. And also, there is
no better bass teacher than this guy in town (and this is a very big music town because we have the IU School of Music, which many say is the best in the country.) The only bass players and teachers here who are above this guy are the bass professors at the Music School.
I mean, if this was just some random guy who I didn't care about, I wouldn't have a problem not associating with him, but this guy is not just my teacher, he's also one of my dad's best friends and the bassist in his band, which makes him one of
my best friends because I'm very close with my dad and I hang out with him and his band all the time. He really is a very, very good guy. That's why this bothers me, because I hate it when an otherwise intelligent, open-minded, good guy has one very bothersome and irrational belief. But I can't just write him off.
Still, I doubt I'll be able to convince this guy. I just don't think it's going to happen. I'd rather focus my efforts on people closer to my own age, who are usually equally ill-informed about guns, but are more open-minded because they're younger.