Therefore the Lord will not rejoice over their young men, neither will he have compassion on their fatherless and widows; for every one is profane and an evil-doer, and every mouth speaketh folly. For all this his anger is not turned away, but his hand is stretched out still.
Isaiah 9:15 The elder and the honorable man, he is the head; and the prophet that teacheth lies, he is the tail.
Isaiah 9:16 For they that lead this people cause them to err; and they that are led of them are destroyed.
Isaiah 9:17 Therefore the Lord will not rejoice over their young men, neither will he have compassion on their fatherless and widows; for every one is profane and an evil-doer, and every mouth speaketh folly. For all this his anger is not turned away, but his hand is stretched out still.
Isaiah 9:18 For wickedness burneth as the fire; it devoureth the briers and thorns; yea, it kindleth in the thickets of the forest, and they roll upward in a column of smoke.
Isaiah 9:19 Through the wrath of Jehovah of hosts is the land burnt up; and the people are as the fuel of fire: no man spareth his brother.
The verse centers on "therefore", "lord", "rejoice", "over", "young", "neither", "compassion", and "fatherless". It is saying that the verse draws attention to "therefore" and "lord", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 16's "For they that lead this people cause..." into verse 18's "For wickedness burneth as the fire it...", so "therefore" and "lord" belong inside that flow. In Isaiah context, the local focus is the Holy One of Israel, judgment and restoration, the servant of the LORD, and Zion's hope.
A plain takeaway is to answer the verse's own emphasis on "therefore" and "lord" with trust shaped by these words, not by a vague optimism outside the passage.