Imagine you discovered atomic energy and accidentally destroyed California.
Do you shut up then run about the country silencing all other atomic physicists on the cusp of a break through or do you hand over your research tot he Government and hope they don't knock out any more states while they're trying to figure out how to destroy all the Arabs with out effecting the oil under the ground.
Cross is guilty and culpable.
Things happen in subsequent episodes and you'll see that he can't trust anyone because this science is far too dangerous to pass on to soldiers and politicians.
The Buebook guy is hilarious but he wishes he had some tech from the 1960s. Every thing he has is secret agent shit invented in the 1950s to fight the Venusian Horde that's been collecting dust for the last 6 decades.