Knowing more detail about anxiety circuits in mice is very very far from helping people living with anxiety disorders.. More research on improving existing human treatments that are known to work well for many people seems to be more justifiable..
I’m pretty sure there was a time when improving steam engines was more “justifiable” than figuring out how to make internal combustion engines too.
Or breeding stronger horses instead of researching steam engines.
So no, that’s not how science works.