Did the Pharisees oppose the death penalty?

Cornelius à Lapide, S.J., commentating on John 18:31 ("It is not lawful for us to put any man to death"), writes: >it was specially the practice of the sect of the Pharisees not to condemn any one to death (see Josephus Ben-Gorion, *Hist. Jud.* iv. 6). But weren't the Pharisees known for following the letter of the law, such as Ex. 22:18 : "Malefactors thou shalt not suffer to live"? They considered Jesus a great seducer, sorcerer, malefactor.