Well of course he should! Had the doctor Number 40 carried out that experiment using Dutton as a communications medium in attempting to gain information from Number 6, then perhaps then Number 2 wouldn't have had the opportunity to intervene. This was just as well, otherwise should the doctor not curb his enthusiasm, then Number 6 might very well have ended up like Roland Walter Dutton. The doctor is too keen you see. He was allowed to go beyond the limit with Dutton, he was expendable. Whereas with Number 6, he has Number 2 to protect him against people like the doctor-Number 40, protection which is not afforded to Number 43.
Be seeing you