Getting a confession is. The Sixth Amendment must be eliminated too. A defendant shouldn't be entitled to a speedy trial and representation by an attorney. Witnesses shouldn't be allowed to testify in a defendant's behalf. Doing away with those rights will increase the number of convictions.
Convictions are important.
Guilt or innocence isn't. The Seventh Amendment must be disposed of also. Defendants don't deserve a jury trial. Jury trials slow things down. After being arrested, defendants should be tortured until they confess, then thrown into prison.