While there is little of news available from this shooting in Texas so far that affects gun control, there is one gun control issue that horribly comes to the forefront.  In late Feb. of this year, as part of his 'vacate anything and everything that Obama ever signed into law,'  Pres. Trump revoked the executive order that Obama has signed that would have included 75,000 new names put on the list of those who could not purchase guns due to mental illness problems.  Thank you very much, Pres. Trump - NOT !!!
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https://www.nbcnews.com/news/us-news/trump-signs-bill-revoking-obama-era-gun-checks-people-mental-n727221