He's in fact the most irresponsible human on Earth, perhaps in all of human history imo. At this pivotal moment, he is wasting tens of billions of dollars on a vanity acquisition because he is profoundly insecure, rather than taking that capital and using it to address some of the pressing threats life on Earth faces now.

If he really gave a shit about "expanding the light of consciousness into the cosmos", he'd be working on ensuring a viable biosphere locally before blowing billions on dopamine clickfarm. As it stands we don't seem likely to have time to establish self-sufficient off-world human presence before we render Earth unable of sustaining much in the way of life or advanced civilization, and as the (second) richest man on Earth, he is uniquely positioned to have a quantitative impact on that outcome. Everyday he wakes up and chooses not to, and people still think he's anything but a mercurial egomaniacal robber-baron, should be considered a coup for his PR staff.

Musk is exchanging some assets and liabilities for other assets, leaving him with a similar balance sheet afterwards. That's not the same thing as "spending" money the way you and I do it.