Lol Psychology isn't a science? You obviously never went higher than Psych 101. Psychologists use the same methods to test hypotheses as researchers do in fields like microbiology, biochemistry, etc. Psychology is a fairly new field of study, with a lot of advancements only occurring in the past century or two. Conversely, microbiology has been around for 4-5 centuries, starting with van Leeuwenhoek, so much more research has obviously been done in that field.
Personally I think both have tremendous reasons to be researched. Obviously, genetics and microbiology can lead to dramatic breakthroughs in fields like medicine, vet tech, and agriculture. Psychology can help us understand things like motivation, perception, and it even ventures into fields like artificial intelligence.
This all coming from a Psychology/Microbiology double major though