Criminals could just resort to kidnapping and severely injuring to avoid pre-crime
They make a point to say the pre cogs only can see murders. They can't see rape or assaults or anything else. Eventually, if this was real, I think criminals like gangs, organized crime, pedophiles, and serial killers would just resort to kidnapping and imprisoning people they wanted to kill. If the mafia wanted someone dead, just lock them up somewhere instead. If a serial killer wanted to keep killing, just start imprisoning his victims. This wouldn't be easy or anything, but could definitely be done by some criminals.
And just severely injuring people would be enough for other criminals. You want revenge on someone, but can't kill them because of pre crime? Just beat the hell out of them. Horrificly injure them but don't kill them.