What makes you think God didn't get it right the first time? The attacker  may have expressed hate because of mental illness; her victims expressed love. 
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Bad things happen. There was even a book written about "Why bad things happen to good people." Bad things happen. But our response to "bad things" says a lot about our character, our morals, our values, and, ultimately, whether we trust God or not for all eternity.
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Compare the actions of these victims of a crime to those who don't hide their hate and disgust of Trump. Some people respond with love, kindness, and prayers......while others respond with hate, hate, and more hate.