Why did Jesus curse the fig tree?

This has always puzzled me - it seemed shortsighted and even spiteful. I had never thought of Jesus' cursing of the fig tree as a parable, but today I found this explanation in The Holy Bible, Writings of Ellen White:

"The cursing of the fig tree was an acted parable. That barren tree, flaunting its pretentious foliage in the very face of Christ, was a symbol of the Jewish nation. The Saviour desired to make plain to His disciples the cause and the certainty of Israel's doom. For this purpose He invested the tree with moral qualities, and made it the expositor of divine truth. The Jews stood forth distinct from all other nations, professing allegiance to God. They had been specially favored by Him, and they laid claim to righteousness above every other people. But they were corrupted by the love of the world and the greed of gain. They boasted of their knowledge, but they were ignorant of the requirements of God, and were full of hypocrisy. Like the barren tree, they spread their pretentious branches aloft, luxuriant in appearance, and beautiful to the eye, but they yielded "nothing but leaves." The Jewish religion, with its magnificent temple, its sacred altars, its mitered priests and impressive ceremonies, was indeed fair in outward appearance, but humility, love, and benevolence were lacking."