Disallowing illegally obtained evidence also has the effect of discouraging the police from illegally obtaining evidence in the first place
Exactly, and arguably it's the only effective deterrent, because courts will be very lenient towards law enforcement officers doing their job, simply out of pragmatism. Law enforcement officers don't all have a precise understanding of the law, there are gray areas in the law anyway, and on top of that, the law is constantly evolving. Prosecuting police officers for illegal searches would be harmful, impractical, and _extremely_ unpopular, so the use of illegal searches and evidence obtained from them would become routine if that were the only deterrent.
Exactly, and arguably it's the only effective deterrent, because courts will be very lenient towards law enforcement officers doing their job, simply out of pragmatism. Law enforcement officers don't all have a precise understanding of the law, there are gray areas in the law anyway, and on top of that, the law is constantly evolving. Prosecuting police officers for illegal searches would be harmful, impractical, and _extremely_ unpopular, so the use of illegal searches and evidence obtained from them would become routine if that were the only deterrent.