How do you think a JW would respond to this if shown?
Here's the official answer from the WT:
Why does Isaiah 45:7 state that Jehovah God creates evil, when we know him to be good and righteous in all his ways?—C. S., Ontario, Canada.
Isaiah 45:7 states: “I form the light, and create darkness; I make peace, and create evil; I am Jehovah, that doeth all these things.” (AS) Jehovah God sows light for righteously disposed ones, and through his Word the Bible enlightens their minds, but he brings mental darkness upon those who willfully continue in a wrong course. (Ps. 82:5-7; 97:11; 2 Pet. 2:4; Jude 13) Peace of mind, even now, is the lot of those devoted to God and his service, and in the new world under the reign of his Prince of Peace all then living will rejoice in that blessed state forever. (Ps. 72:1, 4, 7, 8; Isa. 9:6, 7) As for the statement that God creates evil, it does not mean anything or any practice that is morally wrong. “Evil” as here used does not mean moral evil, of which God could never be guilty, but it refers to a calamity or disaster or destruction, such as he brings upon his unrepentant foes, and that particularly at the battle of Armageddon. From rebellious Adam’s time onward punishment has come from God upon the willfully wicked, and this has been wholly just on God’s part, but it has been as an evil to the ones meriting it. This matter is discussed at great length in the two-part article entitled “Peace and Evil”, appearing in the May 1 and 15, 1930, issues of The Watchtower.
https://wol.jw.org/en/wol/d/r1/lp-e/1951290