The killer in Texas was a psycho who intended to murder his in-laws, and when he found they hadn’t turned up to church that day expressed his anger by shooting people at random. Eventually this bad man with a gun was stopped by a good man with a gun, or he may have killed a lot more people. There is no evidence that this had any anti-Trump motivation, but your other question “Why did Paddock pick a country western concert?” may well be valid.
It certainly is valid to point out that it is Democrats who incite violence in America today and it is Left Wing groups such as Antifa who carry out violence, while simultaneously calling for Gun Control!
While it is not relevant to the Texas Shootings, your list of Trump’s achievements deserves wider readership: perhaps a separate post on Trump’s first year’s achievements?