Absolutely not. DKM is often painted as being saintlier than thou, but in reality it was probably as ruthless as the two other major services. Possibly only the SS was worse but its debateable.
Agree to disagree.
Just please note that "illegal blood" you mentioned was spilled in the same manner by other Navies. (Except the oppression of Jewish sailors). Unrestricted submarine warfare, attacks on neutrals (Soviet Navy did that since November 1939), confiscations, interned crews, shore bombardments with "collateral damage" to civilians, mine laying in the waters of non-beligirents, etc... There is nothing specifically "German" in this sad list.