I honestly don't have a problem with people like you owning a high-capacity semi-automatic rifle. Even one chambered for military rounds that are optimized for people damage (and are coincidentally good for feral pig control). That is your right. But I don't think that right should trump the right to life of those Uvalde children, and it sounds like you would agree.
I think both your rights as a gun owner and mass shooting victims rights to life can be protected. Regulate the ownership of guns to ensure that the pool of gun owners does not include people like Salvador Ramos. That's it, and it would not be hard if the majority of gun owners were of your mind. Provided they can pass a vetting process to ensure they are responsible, law-abiding owners, everyone gets to keep the guns they have now, or want to own in the future. They just have to accept a vetting process, just like we all do before we can legally purchase or drive a car, or legally hunt wild game, or construct a habitable dwelling, etc...
But it is when gun owners not like you take a hard line stance against any sort of gun control whatsoever that the claws come out, frustrations mount and people begin to understandably believe there is no way to work with gun owners. So they start to work against gun owners, because the only option being made available to them is the elimination of private gun ownership.
I am a gun owner, I love to shoot, I've taught my kids how to shoot. We live on a ranch, and guns are often a necessary tool here. I was away on business two weeks ago, and my 13 year old son had to shoot a rattlesnake that had taken up residence in our barn. My wife was freaking out, I was away, and he took it upon himself to ask her to get the .22 so he could do what needed to be done. She did, and he did -- thoughtfully and safely. I was incredibly proud of him and view it as a huge milestone in his becoming a man.
But if the only choice being offered to me is that experience of gun ownership, or a growing pile of dead kids that will never have a chance to become men (or women), then I have to side with people like Longhorn_Fan68. Take the fucking guns.
But I would much rather gun owners just work with the rest of society to make that unnecessary. Our internal brinksmanship is so fucking stupid.