Just a quick note of something I may return to later: the underlying ethos of Traveller is almost the twin of that of OD&D.
Both games assume the characters are ne'er-do-wells on the make. The classic format of a Traveller adventure involves the characters undertaking illicit activities in order to make large sums of cash, this way of life being made possible because they're outsiders -- travellers -- unconnected to the local planetary social structure. The larger social context of the game is a lawless (or nearly so) frontier where legitimate authority is distant, corrupt, or both. In short, it's another example of Western tropes being applied to a different genre, just like D&D.