Why would police try to solve rape and murder cases when arresting people for drug possession/loitering/panhandling is easier, simpler, and guaranteed? I wish I

Why would police try to solve rape and murder cases when arresting people for drug possession/loitering/panhandling is easier, simpler, and guaranteed? I wish I could add a /sarcasm tag to this, but it is not sarcasm. When normal everyday activities are criminalized and the police is incentivized simply by the number of arrests they make, why wouldn't they go for the low hanging fruit? It's not like police have ethics or honor to guide them. They are a brute force machine of state violence without morals or ethics. Expecting anything but the bare minimum from police is delusional. Hell, most of the time, expecting the bare minimum is delusional. If expecting police not to murder innocent civilians is clearly too high of an expectation--it is in the US--expecting them to solve rape and murder cases is a stratospheric, ridiculous expectation. Not to mention that many citizens are simply terrified of police. How are we, citizens, supposed to keep these thugs in check when they can legally murder us for no reason without any recourse whatsoever? Sure, if it came up on a ballot, I'd vote for reform because a ballot is secret. Expecting people to stand up to police and voice their concerns in public, putting their own lives and the lives of their family in danger in a futile attempt at police reform, is simply too much to ask of ordinary citizens. Also, most of the people that don't fear police aren't even aware of the problems with police. In this way, nothing gets done.