Yes, it was definitely a self-inflicted wound, or maybe a tacit acknowledgement that the campaign was doomed anyway, before the public numbers made it obvious. There is a career path to being on the record with that position, though not in statewide political office in Texas.

I grew up in Florida and lived most of my adult life in Texas, and guns have always been a presence. I still own several, but they've been locked in my father-in-law's garage for several years now; I'm ambivalent about what to do with them, and I don't find any joy in "target practice" or fetishizing them as a hobby. Skeet shooting with cheap bird-shot might still be pretty fun, but my single-shot 12ga will be perfectly adequate for that if I ever take it back up.

Chronic gun violence is a tragic, horrific thing that is a fact of life in the US, which is unique among stable democracies. It should be low-hanging fruit to regulate guns very heavily, but due to weird quirks of history and even fuckin' grammar, it's not. The only solace is that while gun violence in this country should be near zero, like it is in almost every other stable country in the world, it's not actually a daily threat for most people. It's a statistically significant cause of death for people who shouldn't normally be dying, but it's possible to overstate the impact of the actual numbers. It's still rare, though unlike the other equally rare things on the list (e.g. cancer, heart attacks), it's completely preventable, in theory, and therefore even sadder and more frustrating.

So theory is nice, but the history and legal framework around guns in this country means anything beyond baby steps is a political nonstarter and very nearly as hard as "curing cancer". While I acknowledge it literally costs lives not to act, it will cost more, including more from gun violence, over the medium term, to campaign in ways that lose close elections to people who would love to dismantle the already inadequate social safety net and encourage "old timey" open racists and even worse foreign policy than we have now. Those who feel passionately about guns should not be silent, but if you're running a surprisingly competitive campaign in a stubbornly red state, you should consider the political implications before committing to unrealistic goals that piss off people who could be persuaded to vote for you if they don't think guns are your priority.