Unfortunately many people cannot or will not change their minds on a subject. The definition of a fanatic is someone who cannot change their mind and will not change the subject.
I might as well as admit that up until around early 1982, I was moderately anti-gun. I wasn't a rabid anti but I thought licensing handguns everywhere was a great idea. I believed no one should carry. I was shocked when, several months after he was shot, Ronald Reagan came out against further gun control measures. This was also the time of the big Teflon coated bullet BS (KTW bullets which an anti-gun wag said stood for Kill This Way) and I couldn't understand why they were allowed to be sold. Then I did something interesting. I went to the library and started reading (this was of course before the Internet so you really had to work to find information) and discovered my gun education up to that point had been conducted by the media. I was also in ROTC and had several training sessions with GM Hydramatic M16A1's. Friends in ROTC told me if I really enjoyed the M16A1, I could get an AR-15 that differed only in not being able to fire automatically. Then after attending a lecture at college on gun control that actually wound up being an anti-gun control lecture (perhaps due to the professor running the lecture series being a conservative - rare in a college) I changed my mind and in May 1982 I bought a genuine Colt AR-15. I joined the NRA in 1986 after realizing there is a big disconnect between their public image courtesy of the media and what they actually do.
Since then, I have changed my mind on gay marriage. I was not rabidly against but I was not crazy about it. However, knowing several people who would benefit by it and realizing they aren't a threat to me or society, I changed my mind. Same on red light cameras. I hated the big brother aspect of them but shortly after New York State approved them for Long Island, I had three memorable incidents happen to me by red light runners that convinced me I had better change my mind. There is nothing like being on a bicycle with the green light and having a car blow through the intersection on a red light. Missed me by inches.