Why would Snowden steal four laptops from the US government if not for the data on them? Is the theory that he took them for his own personal usage, rather than

Why would Snowden steal four laptops from the US government if not for the data on them? Is the theory that he took them for his own personal usage, rather than taking a personal laptop he already had with him? If so, why four? Also the idea that a hashtag on twitter can "debunk the silly rumors" itself seems rather silly, as the entire argument rests on the word of Snowden/Wikileaks/Greenwald/etc. There is no verifiable way - on either side of the argument - to know what is going on inside the special transit section of the Moscow airport he is holed up in.