There are some very good arguments for increasing space funding, and this is not one of them. It seems like you're just saying "social problems can't be fixed, so we should ignore them." It's also weird that you don't consider bringing clean water, health care, etc. to more people to be "moving forward as a civilization".

You might, for example, instead point out that even extravagant space budget proposals are a drop in the bucket compared to military spending.