In the SE US there are any number of very socially and politically conservative people that don't think anything other than traditional hunting long guns should be in the hands of "decent people". Be careful about using limited local experience to overgeneralize when thinking about firearms rights issues.
This.
One of the few people I personally know who simply refuse to shoot, own or carry a firearm is one of the most conservative and politically active individuals I know. Tea Parties and the like. She is terrified of firearms to the point that she will scarcely discuss them. I also have a feeling she lends some credence to the widely-propagated myth that the Bible condemns self defense, and she's not the only Christian I've encountered who believes this; though as someone who's done the studying to know that this is simply not the case I've been able to change a few minds. Some religious folks are stubborn on this issue though, sometimes more so than those who would identify themselves as leftist.
Keep in mind that many so-called liberals and anti-gun folks are not stalwartly so. Many simply lack the physical experience of handling and understanding a firearm to combat what they've been duped into believing by a largely ignorant society. To effectively win over these types, firearm owners must be able to contrast the negative image that's been projected onto them as crude, unsophisticated, unapologetic and unempathetic by simultaneously being NONE of those things and ready and willing to educate on the subject. From watching the video the OP seems to have done an excellent job at accomplishing this. Kudos to you sir!
"And the Lord’s servant must not be quarrelsome but must be kind to everyone, able to teach, not resentful. Opponents must be gently instructed..." 2 Tim. 2:24-25. Whether you're a Christian or not these are excellent ideals for the 2A supporter to live by and will go a long way in effecting support for the cause.
As far as the hour-long safety lecture is concerned, anyone who teaches weapons safety on a day-to-day basis to persons who are totally ignorant of firearms knows that it usually takes at least that much time to truly develop a person's senses and understanding to the point that they will NOT violate at least one of the five rules as soon as they pick the weapon up. Hands-on instruction with the weapon unloaded following simple and understandable verbal instruction helps immensely. This helps to determine whether or not they truly understand what you just explained to them. I help run a paintball field on weekends and though the markers are not actual firearms they can be misused to dangerous effect. As such we choose to teach a well-rounded weapons safety orientation each morning and continue to reinforce safe weapons handling practices throughout the day. It is NOT an easy task especially with that many people, but it can be made much easier by taking a significant amount of time out for training and education on weapons handling at the get-go. It cannot be done effectively in a couple of minutes. If we spent that little time on marker handling we'd be having all sorts of mishaps. We've tried and paid for it every time. Point; you can never spend enough time teaching safety, but you CAN spend too little.
After a mag each they couldn't put the guns down. Now they want to shoot every week and have me teach them. 
You dog, you 
