Science becomes corrupted when the research focuses on finding proof of and ideal instead disproving it. There are no aliens. With the money wasted on looking for aliens we could have saved millions of lives with clean water, shelter, food and education. Scientists need to stop deluding themselves and tricking congress into funding pet projects that are so far fetched they border on fraud.
Total world expenditure on science projects of any kind at all is downright negligible compared to biggest expenses, such as military, as pointed out...Life conditions, solutions to pollution, most harming diseases etc, could all be fairly easily solved in rather short timespans of 5-20 years probably. The thing that's missing is not the money, it's the humanity's collective consciousness, maturity and responsibility - instead of all I mentioned above, we're still very much busy throwing feces at each other over imaginary borders, or deadly fairytales called religions, and trying to earn more than our peers, so we can buy a shinier thing they will envy.