Whether a man should be debarred from receiving Orders on account of homicide?

Objections

Objection 1 : It would seem that a man ought not to be debarred from receiving Orders on account of homicide. Because our Orders originated with the office of the Levites, as stated in the previous Distinction (Sent. iv, D, 24). But the Levites consecrated their hands by shedding the blood of their brethren (Ex. 32:29). Therefore neither should anyone in the New Testament be debarred from receiving Orders on account of the shedding of blood.
Objection 2 : Further, no one should be debarred from a sacrament on account of an act of virtue. Now blood is sometimes shed for justice' sake, for instance by a judge; and he who has the office would sin if he did not shed it. Therefore he is not hindered on that account from receiving Orders.
Objection 3 : Further, punishment is not due save for a fault. Now sometimes a person commits homicide without fault, for instance by defending himself, or again by mishap. Therefore he ought not to incur the punishment of irregularity.