By looking at their merits? Giving a sandwich to a guy sleeping on the street does infinitely more for them than us reaching Mars.
Are video games worthy? Anything consumer for the sake of consumption is arrogance in its purest most refined form.
You must have grown up with a Mommy and Daddy that got along well and always provided for you, so you think space exploration is something noble, when in reality its a rich elitists nationalistic jerkoff game, where you engineers are the pawns fueled by childish and selfish ideals. Yes, you might discover something that helps elsewhere, but coincidence is hardly synonymous with intention.
Repeat to yourself how silly it is to look for aliens. "I am looking for aliens." Repeat that 1000 times to yourself until you realize how stupid of a goal that actually is.