Unfortunately, I don't think that the main issue is access to guns, even though limitation to access would certainly make these horrible incidents less likely to happen. Nor, even though many will try to say that the man was simply deranged -as is the case when the perpetrator is part of the majority population - or otherwise mentally troubled, I believe we can't pin this one on mental ailment. Having read the alleged document found on the site of the attack from the source Vanoi supplied, the reasons the attacker lists are mainly political.
According to the perpetrator, the liberals and the corporations are using the migrants to enfranchise them and dominate the elections in the US in the future. He assaulted people from the 'sizable' Mexican population living in Texas because, according to him, the Mexicans en mass have begun supporting the Democrats and if Texas is lost to the republicans, then the presidency is in peril to be lost forever.
The main problem I see here is that a group of people who, being in the majority population, hard-working, lawful (up to now), by-the-book Americans are seeing that their lives are not getting any better, even though everyone is telling them the crisis of 'o8 is successfully behind them and that the economy is doing splendidly. In other words, they are sensing what the IMF shown pretty
recently. I quote from the economic outlook for 2019
So, according to the IMF, the wealth generated was spread even more unevenly, drug abuse and suicides are rising, cost of living is rising at rates much higher than the real wages, the poor are even poorer than the poor of '83 were, and the new generations of people are now projected to fare worse than their parents.
But the economy, they hear everywhere is doing good. So, what's wrong? And here comes the conspiracy theories. Some people are understanding of the fact that they are being gradually left behind by the system, even to the point of deprivation. At the same time, the public discourse has been about civil rights and human rights - completely ignoring their sad state of affairs.
But here is where it goes wrong. Instead of understanding that, yes, protecting the most vulnerable isn't easy but is every humane society's moral obligation, some people read between the lines to discover a plot. This plot encompasses a lot of different arguments, real and imagined, but goes mainly like so: the elites are trying to enfranchise those who currently cannot vote, and are trying to make them the majority in the country because that's the way they will depose the republic.
Of course, they seem to neglect the fact that the elites are very content with them thinking that since it doesn't really target them directly - the rage is pointed primarily towards those who have the least to do with anything and with the least influence to help themselves, the minorities.