Why didn't Buzz close his helmet all the time?

In Toy Story, Buzz had to close his helmet all the time because he thought the air would be toxic if his helmet was opened. After he saw the commercial and found out he was a toy, he could open his helmet because he knew the air was fine. Why didn't he close his helmet all the time like Jessie, Woody and the... show more In Toy Story, Buzz had to close his helmet all the time because he thought the air would be toxic if his helmet was opened. After he saw the commercial and found out he was a toy, he could open his helmet because he knew the air was fine. Why didn't he close his helmet all the time like Jessie, Woody and the other few toys who wore hats all the time?
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