@Mr.Bultitude
Makos 7a. The Mishna says "... A Sanhedrin that executes one person in 7 years is called a 'bloody court'. Rabbi Eliezer ben Azaria says once in 70 years. Rabbi Tarfon and Rabbi Akiva say, 'if we had been on the Sanhedrin, nobody would ever have been executed.' Rabban Shimon ben Gamliel answerd, 'and they would also have increased bloodshed in Israel.'"