Glenn Greenwald of Britain's The Guardian newspaper said Edward Snowden chose the semi-autonomous Chinese region because it was the least bad option open to him.
Greenwald said in an interview that Snowden wants to remain out of the "clutches" of the US government for as long as possible but is fully aware that he won't succeed.
Snowden says he worked as a contractor at the National Security Agency and the CIA.
The Guardian reported that Snowden arrived in Hong Kong on May 20. He checked out of a Kowloon hotel today and his current location is unclear.
The Justice Department is conducting a criminal investigation into the leaks at the request of the NSA.
"If the Justice Department does end up indicting him, which almost certainly it will, it's basically inevitable at this point, he doesn't really trust the judicial system in the United States to give him a fair trial," Greenwald said in Hong Kong.
He said Snowden chose Hong Kong because it has a history of strong political activism, free speech and respect for the rule of law. But he added that once Snowden decided to leak the information, "all of the options, as he put it, are bad options. There were no good options for him."
Hong Kong, a former British colony, was handed back to China in 1997 but was allowed to retain a high degree of autonomy and its own legal system. The city has an extradition treaty with the US, but it contains some exceptions, including for crimes deemed political.
