The antithesis to this would be the police pinning another nearby robbery on your relative just cause he is guity already, or violating his right in some way.
Keeping someone in prison costs tax payers about $70,000 per year (directly). In addition to that, it increases the chance that their family will need government aid, decreases the average educational level reached by their children, and isn't especially effective at deterring crime.
Furthermore, just because someone is guilty doesn't mean that the law is just. In the past, we have locked up people for (illegally) escaping slavery, being gay, publishing books the government doesn't like, and many other unjust laws. Currently, there are about 3 million people in prison for no crime other than drug possession, despite the fact that countries like Portugal have shown that decriminalizing drugs yields far better outcomes for individuals and society as a whole.
Lastly protecting the rights of the guilty is critical because doing so is the only thing in the US that protects the rights of the innocent. Countries like the UK are set up to charge officers and prosecutors who violate rights with crimes. In the US, however, we've decided that the better approach is to prevent misconduct by not allowing evidence that was obtained improperly. We as a society can not be lax on misconduct against the guilty because it is the only defense the US has against misconduct against the innocent.
Woah, hang on. I've lived in the UK all my life; I've never heard of a prosecutor being charged. Officers can usually escape charges by taking early retirement; policemen are hardly ever charged with violating the rights of members of the public, even if they kill them.
That is not the UK I know.
On it's own I take this to mean that we need to address the issues in policing and the justice system to have a lot less bullshit and a lot more impact. Time/money (and resulting fallout) spent harassing innocent people creates all manner of problems and is also time/money not spent on actually doing the job. In this I wholly agree.
That said, There is still room for nuance and appropriate recourse in actual crime. There are a lot of crimes, and it's pretty clear that in many cases the punishment doesn't fit the crime, or that the crime even makes sense.
Ultimately if we ever get our shit figured out I'd assume both of these would be accomplished. I just hope that we get there.
Ow, wow. That's like 17th century thinking right there, when we used to hang people for petty theft, executions were a public holiday, folks thought it would deter crime but it stayed sky high.
Also boiling people alive was a thing, and, most egregiously, we overboiled them.
I am willing to bet that you or someone in your family or friends has broken some law somewhere at some point, possibly without realising. I don't think this line of thinking leads to a good place.