Earlier quoted context omitted.
(stolen money should not be spent in more or less important things, it should be returned to their rightful owner so they can choose what to do with what they've earned) Just to be clear.. Your issue is not that money from taxes is spent on scientific research and space exploration, but really that you have to pay taxes?
My issue is, whoever wants to accomplish something that takes a lot of money to make happen, should do like ARKYD and make a kickstarter or any other peaceful alternative, that allows for every individual to choose whether they'd like to participate. My issue is that running to the government, just because it already has guns in place pointing to every individual's head in case they don't pay, and saying "we'll steal…
I do actually think you have a bit of a point. It would probably be more ethical to spend the space exploration money in other areas. However, there is much lower hanging fruit for things to cut out before we reach space exploration (warmongering and defence budgets for example)