Thankfully, I didn't lose anyone in the Orlando shooting. However, on different occasions, I've lost several relatives and one friend to gun violence. They were all shot and killed in Crimes of Passion, with weapons purchased shortly beforehand without a problem. One shooter was a substance abuser, and another was undergoing treatment for psychological problems, and neither should have passed a decent background check and been allowed to buy a weapon. I really wish they hadn't, but that's how it is right now in the US. I hope we can change this in my lifetime.
The NRA et al. have worked hard and spent a lot of money to create the narrative that laws are powerless to stop gun violence, and that the only cure for the misuse of Guns is to have More People buying More Guns, and apparently holding them against each other's heads all the time. This is sociopathic and absolutely fucking insane as a model for a society; a constant Cold War with your neighbors, with mutually-assured destruction on a person-by-person basis? And yet the myth persists, against all odds. If you yourself are a believer, I urge you to take a step back and consider some things.
Consider, first, where the money is in this situation. Guns and Gun Manufacture are a colossal industry with incredible spending power; very large organizations like the NRA are given much of these profits to fight Gun Control on all fronts, discrediting and misrepresenting legitimate studies, funding slanted studies of their own, creating a network of propaganda and magazines to spread their curated information, hiring huge teams of lawyers and lobbyists, and "donating" to cover the campaign costs of a large number of congress members (and using that as leverage to keep that congress person sympathetic to their business). This is public knowledge, yet some people still continue to treat their platform as anything other than self-sustaining propaganda.
Secondly, a quick crosspost from the Sad Thread.
...but when the "If everyone in that club had guns, this wouldn't have happened" argument came out, I tried my best to explain how these sorts of mass killers don't usually expect to survive, and often commit suicide right afterward. They see themselves as heroes and martyrs, whose actions and deaths will be publicized by the news and become an inspiration to other violent extremists who share their views. More guns don't stop that... being gunned down in response only helps further polarize the folks that sympathize or idolize these killers.
Shooting At The Bad Guys, or even holding guns at each others heads every day of our lives, just makes it a fight, and Humans have a really shitty neuropsychological loophole when it comes to fights. Get enough Anger and Adrenaline in your bloodstream, and it shuts down your Empathy and Conscience; we literally can lose the capacity to understand others, accurately judge what they're thinking, etc. if we think someone or their "group" wants to fight us. This is why Fearmongering, indoctrination into certain forms of violent extremism, and similar propaganda works on us Humans. This is our psychological nature, being used against us by unscrupulous people who want to maintain forms of power.
Finally, to preempt some rebuttals. Yes, laws cannot actually control people's behavior, just like locked doors can't actually prevent people from breaking and entering; if someone is dead-set on it, they'll bust a door down or break a window, get in, and hope to escape before the cops show up. Yet, no one thinks twice about putting locks on our homes anyway. The goal of these security systems, much like laws, isn't to prevent break-ins from being possible; it's to scare borderline criminals away from committing a crime, to make the crime take more effort or expertise and impeding the crime itself, and to slow down Crimes of Passion done in the heat of the moment, in hope that their conscience or empathy have time to kick back in.