"Please tell me of any person God killed without a good reason."
Ummmmm
"And it came to pass, that at midnight the LORD smote all the firstborn in the land of Egypt, from the firstborn of Pharaoh that sat on his throne unto the firstborn of the captive that was in the dungeon; and all the firstborn of cattle. And Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt; for there was not a house where there was not one dead." --Exodus 12:29-30--
"So the LORD sent pestilence upon Israel: and there fell of Israel seventy thousand men." --I Chronicles 21:14--
"And he smote the men of Bethshemesh, because they had looked into the ark of the LORD, even he smote of the people fifty thousand and threescore and ten men: and the people lamented, because the LORD had smitten many of the people with a great slaughter." --I Samuel 6:19--
"And the earth opened her mouth, and swallowed them up, and their houses, and all the men that appertained unto Korah, and all their goods. They, and all that appertained to them, went down alive into the pit, and the earth closed upon them: and they perished from among the congregation. And all Israel that were round about them fled at the cry of them: for they said, Lest the earth swallow us up also. And there came out a fire from the LORD, and consumed the two hundred and fifty men that offered incense." --Numbers 16:32-35--
"Thus saith the LORD of hosts, I remember that which Amalek did to Israel, how he laid wait for him in the way, when he came up from Egypt. Now go and smite Amalek, and utterly destroy all that they have, and spare them not; but slay both man and woman, infant and suckling, ox and sheep, camel and ass." --I Samuel 15:2-3--
"And he brought forth the people that were therein, and put them under saws, and under harrows of iron, and under the axes of iron, and made them pass through the brickkiln: and thus did he unto all the cities of the children of Ammon. So David and all the people returned unto Jerusalem." ---II Samuel 12:31---
"The righteous shall rejoice when he sees the vengeance. He shall wash his feet in the blood of the wicked." --Psalms 58:10--
But of course the suckling infants of Amalek were asking for it, right?