Perhaps. Do you think there exists logical and reasonable steps of justification for this action? I don't.
In the normal western cultured mind? Nope. But that may not be what we are dealing with here.
Maybe he saw the crowd as the meeting of all those critters that steal socks out of the dryer, gathered together and hiding in plain sight as country music fans but really getting their target list for the next decade in code hidden in the music and decided to save countless humans from the frustration, time involved, and expense of looking for that other sock.
We don't know what was going on in his head, so we can't say what frame of reference nor base assumptions were used in him arriving at the point where he apparently thought shooting out a hotel window and murdering dozens of people was a good idea.
But somewhere in there, he went to a lot of trouble to plan, set up, and execute that plan, which implies the capability to think rationally, even if we don't consider his acts nor the motivation (whatever that was) to be rational in our own set of values, rules, and beliefs we perceive as rational thought. He's running under different rules.
