Bradbury shows that putting too much trust in technology is dangerous by showing a society where it takes precedence in actions.
Explanation:
Ray Bradburry had been one of the foremost authors of science fiction that had been writing for people to understand that there had been issues on machines and technology that the people do not understand have more to do with human consciousness and its trust on the things it is subordinating to itself
This belief can lead to the downfall of humans as they would rarely consider all the things they must consider about the machines and end up being ruled by machines they made.
The sentence that shows that Icarus is reckless is "Who could remember to be careful when he was to fly for the first time?" Reckless is the opposite of careful. When Icarus was told to be careful, he did not even listened to his father as shown in the preceding sentence: "For Icarus, these cautions went in at one ear and out by the other."