The following episode from Bhagavatam clearly says that Krishna got angry on washerman and then killed him.
SB 10.41.32: Seeing a washerman approaching who had been dyeing some clothes, Krishna asked him for the finest laundered garments he had.
SB 10.41.33: [Lord Krishna said:] Please give suitable garments to the two of Us, who certainly deserve them. If you grant this charity, you will undoubtedly receive the greatest benefit.
SB 10.41.34: Thus requested by the Supreme Lord, who is perfectly complete in all respects, that arrogant servant of the King became angry and replied insultingly.
SB 10.41.35: [The washerman said:] You impudent boys! You're accustomed to roaming the mountains and forests, and yet You would dare put on such clothes as these! These are the King's possessions You're asking for!
SB 10.41.36: Fools, get out of here quickly! Don't beg like this if You want to stay alive. When someone is too bold, the King's men arrest him and kill him and take all his property.
SB 10.41.37: As the washerman thus spoke brazenly, the son of Devaki became angry, and then merely with His fingertips, He separated the man's head from his body.
SB 10.41.38: The washerman's assistants all dropped their bundles of clothes and fled down the road, scattering in all directions. Lord Krishna then took the clothes.
SB 10.41.39: Krishna and Balarama put on pairs of garments that especially pleased them, and then Krishna distributed the remaining clothes among the cowherd boys, leaving some scattered on the ground.
Krishna didn't tell that he killed to give moksha. There should be a genuine reason for killing a person and the quarrel with Krishna is absolutely not a genuine reason to do such killing (I feel).
It's nice if the answers avoid the following trivial ones(unless strongly referred):
1) To give moksha.
2) Being almighty god.
3) Due to quarrel and anger.
Is there any other genuine reason for killing an ordinary washerman, who is not even a Kshatriya? Does any other text(s) explain this incident in detail?