The victim pays the price. Even if your rights were violated, this rule often means the case gets thrown out, so you get zero compensation for your injuries or losses.
It keeps dangerous people in power. Because it is so hard to punish bad behavior, reckless officials face no consequences. This means they are free to stay on the job and potentially hurt others.
The legal system uses this rule as a shortcut. Instead of a long trial to find the truth, judges use this rule to dismiss cases immediately, saving the government time but denying you a fair hearing.
It makes the Constitution optional. If police cannot be punished for violating the rules, then the rules do not really exist. This creates a system where government agents are above the law.
The problem is a No-Win Loop . You lose your case because there isn't a past case just like yours. But because you lose, your case cannot become the "past case" that helps the next victim.