Re: Let's start with the basics and then work forward from there.
Do NOTHING until ALL of humanity's problems are solved
I don't agree with that approach but I do sympathise with the view that there can be better and more worthwhile things to spunk tens of billions on.
I recognise that even tens of billions are a drop in the ocean when it comes to how much we would need to solve the problems the world has, how little such huge sums amount to when divied-out across the people who need help, but it often does feel our priorities are very wrong.
It's not unreasonable that some people feel the same way about space exploration as others do about 'wasting money' on HS2, nukes, armies, art, free healthcare, or whatever their pet peeve is.