Actually I saw Texans thanking President Trump for giving them everything they had asked for and more, without any bureaucratic bungling between State and Federal agencies. To his credit Donald Trump used his Presidential powers to declare Texas a Federal Emergency (not just a State one) before Harvey made landfall: that meant FEMA could access Federal funds and get resources in place before the flooding.
I know this doesn’t fit your assessment of Donald Trump, but he did everything that GW Bush should have done for Hurricane Katrina. President Trump gets an A+ for his response to this crisis, but the Left of course refuse to see this.