This may be shocking to some people, and in fact I know it will be shocking to some people, but Martin Luther King Jr. was evil, and that is not hyperbole.
Just to get this out of the way, his fight against government segregation was a totally legitimate and morally praiseworthy fight. However, almost everything else he stood for, both concretely and philosophically, was totally corrupt.
First of all, let us be clear on what kind of morality MLK is talking about here. Do not delude yourself into making him a blank page on which to draw your own personal values. King was a socialist, avowedly, and certainly an anti-capitalist. He was pro-slavery at the most basic level, as evidenced by his attacking property rights as immoral.
We must rapidly begin the shift from a thing-oriented society to a person-oriented society. When machines and computers, profit motives and property rights are considered more important than people, the giant triplets of racism, materialism, and militarism are incapable of being conquered.
That quote is disgusting, but consider what he is actually saying, and what he actually marched for. King is not simply proselytizing leftist and religious anti-capitalist falderal in an attempt to convert you; he wants the government to threaten you with a gun and throw you in jail, something he endured, if you do not agree with him. If you are morally repugnant enough to want to discriminate based on race, King does not just want to change your mind; he wants to steal your property and dictate how you use it. He places needs above rights, which is the primary moral principle underlying Christianity, Socialism, and Communism. What exactly does he mean when he says people should take priority over property rights? He means slavery. He means that if some people are unhappy, your right to your property must go; you must toil while others reap the benefit of your work, the very definition of slavery.
After all, consider that the event in which King delivered the famous I Have a Dream speech was the also-famous March on Washington for Freedom. Oh, wait a minute, no it was not. It was actually called the March on Washington for Jobs and Freedom.
Notice the corruption of the word freedom. Freedom means you have individual rights, which consist of freedom from force. What King wanted was self-contradictory. He wanted the government to force the provision of jobs through either outright threats or the expropriation of wealth, and freedom. Of course, what King really wanted was Orwellian freedom. Freedom is Slavery in the most literal sense for King. You are not free unless you have enslaved another man to provide your needs.
There is of course far more to his horrid beliefs, such as his sickening view of the Vietnam War and his absurd conviction and out-of-context negative appraisal of the idea that the U.S. was the greatest purveyor of violence in the world in 1967.
School children have been inculcated for generations with the Trojan Horse idea that he was a great man, and so when they get older they must concede a little bit more and a little bit more to the left and the nihilist egalitarians whenever they bring up MLK. Martin Luther King Jr. was revoltingly anti-American, and it is shameful that a federal holiday was made of him, and even more shameful that he is used, as is Mahatma Gandhi, as a tool by which people get the government to force universal adoration of a freedom-hating icon in order to weaken the position of the freedom-defenders and make them break down in contradiction when they find themselves caught between what they implicitly recognize as the truth and the positive psychological associations for a monster forced on them from childhood.
The only gap between our technological progress and morality is the one he served in large part to widen, though, to be fair, he also shortened that gap by legitimizing socialist policies and thereby greatly slowing the technological growth of the United States and the world. Congratulations Dr. King, in the race to catch up to technology, your morality is running the course backwards, but at least it can never get too far behind, because it is dragging the goal post right along with it.