You say we don't know the motivations yet you talk alot about what those motivations are. Sorry, can't have it both ways.
Sure I can. I don't know what kind of car you drive, but I can speculate in generalities what it probably looks like (I'm guessing it has four wheels, an engine, a windshield, a license plate with between 4 and 8 letters and numbers...).
My point about the Fermi Paradox, though, is that it basically follows from the question "If there are other people in town, how come they don't drive past my house?" The paradox ceases to be a paradox when you consider, in order of relevance, the possibilities that
1) They don't own cars
2) They don't have a reason to drive past your house
3) They DID drive past your house before you lived there
It's only a paradox if you assume that because someone owns a car is sufficient reason to drive by your house and visit you.
Either you know or you don't, but you can't tell me I don't then go on to say why these aliens are do things. (or not doing them)
Well, you clearly don't know why I haven't gotten in my car and gone and driven by your house, but I should think you'd be smart enough to think of the most obvious possibilities.
Well, at least Elon Musk is trying to get us into space for a good reason - survival
Elon Musk is trying to get us into space TO MAKE MONEY. Which is by far a more reasonable motivation since he has a fairly good chance of accomplishing this. The catch is, our survival as a species probably depends--in the long run--on his ability to
continue making money in commercial space development. The primitive monkey-brain that runs the average voter/politician in America isn't likely to find anything more long-term than that all that meaningful.