"Why do the heathen rage, and the people imagine a vain thing?
The kings of the earth set themselves, and the rulers take counsel together, against the LORD, and against his anointed, saying,
Let us break their bands asunder, and cast away their cords from us.
He that sitteth in the heavens shall laugh: the Lord shall have them in derision. " Psalm 2:1-4
And so when a man is a man of God and he is speaking what God puts in his mouth, how could it be wrong? Did Elijah add anything to what God gave him to say on that day? Perhaps later if it pleases God we will know for certain...