Post 4:

Our Lord Himself confirms this power of capital punishment in the interview with Pilate before His crucifixion:
"Pilate therefore saith to him:  Speakest thou not to me?  Knowest thou not that I have power to crucify thee, and I have power to release thee?  Jesus answered:  Thou shouldst not have any power against me, UNLESS IT WERE GIVEN THEE FROM ABOVE.... (John 19:10- 11)

He also seems to speak of the appropriateness of capital punishment in another passage:  "But he that shall scandalize one of these little ones 
that believe in me, it were better for him that a millstone be hanged about his neck and that he should be drowned in the depth of the sea" (Matthew 18:6)