why an activist was DENIED asylum

The Asylum Officer denied asylum to Mr. B, from Burma:

-B protested in Burma in 2005; then he was allowed to leave Burma in 2006. Why wasn't he arrested at the airport as he was leaving? this shows that the government did not care about him.
-in 2006, B arrived in Kenya, where he created a blog and criticized his government. Then, in 2007, B returned to his "dangerous country" where he was not arrested again
[apparently the government does not care about blogs which criticize]
Then, in 2009, B left his country again. Why wasn't he arrested at the airport? how come he was able to re-new his passport? This shows the government does not care.
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B then arrived in USA, where he criticized his government on his blog and protested on the sidewalk in front of his Embassy.
-B testified that government agents went to his mother's house in Burma, and asked her where B was, and what B was doing. This shows that the government did not know about his blog and protests.
-Asylum denied. The government of Burma does not care about B.