You are not only disingenuous when it comes to what Dr. King believed (Social and economic Justice) you don't believe in it yourself and I'll prove it in a few short sentences.
You've quoted Dr. King who you claim using his words advocated for incomes to be either "guranteed" or "distributed" under something you called "Democratic Socialism". Right now Black unemployment is at the lowest level it's ever been recorded since it's been measured. Are those incomes those folks are earning being "distributed"? Are those folks earning those incomes being discriminated against? Are those incomes guranteed if those folks don't show up for work? Is Capitalism not working for those folks?
Dr. King demanded Black people be afforded the same chances to improve their lives economically as other folks enjoyed in this country. We have Black millionaires, and we have poor Blacks. Should the hard work the wealthy Blacks achieved be taken from them and given to the poorer Blacks who yet to acehive their dreams? Is that what Doctor King favored, or was it his dream simply to see all Blacks at least with the same opportunity to earn millions or become millionaires like any other Americans? Would Doctor King want their chances or incomes limited? Is that really what you think he was arguing for and not instead for unlimited Freedom to pursue their dreams to their God Given talent based on the content of their character and not limited by the color of their skin under a free market economy that recognized both their character and talent?
What about yourself? Do you believe incomes should be distributed or guranteed? If you do you should put your belief system to work. I don't know what you earn, but if you believe in the equal distribution of incomes you should find a poor Family making half of what you earn, and use your own extra income to "re-distribute" it to them so that they can have exactly half of what you currently earn. Redistribute your own income to some poor Family so that they now have what you have or have worked for. Will you do that?
Probably not. Yet you will vote for some politician to do it for you! You are OK with Government confiscating virtually half of all incomes and redistributing them as long as it's not done to you. Despite those incomes being "redistributed", we still have abject poverty in this country. That doesn't work and you know it because you won't practice it yourself.
Doctor King if he were alive today would no doubt be pleased with both the oppotunities as well as the progress most Blacks currently have made participating in our free enterprise free market based Capiitalist economy. None of the earnings Blacks currently command participating in the free market economy is coming from Government. No incomes are "guranteed", but none is being "equally" re-distributed either. Blacks today simply have a chance to earn as much as they can doing whatever they are good at serving themselves by accessing the economic opportunities that are being made available to them by an expanding free market economy that also includes them.
This was Dr. King's dream and hope for all Black people that you don't understand when you claim he was a Socialist only interested in how incomes are "distributed equally". You are insisting Dr. King would not be satisfied with our Capitalist system today, or how Blacks are performing in it. Yet you do not lead by example and redistrbute your own income to one of those poor Blacks who may be now just starting out to make their own way so they can have at least a chance to earn the same stuff as you have spent your time working for. Wonder why not? I also doubt Doctor King would require anyone such as yourself to give up their incomes or possessions just so someone who didn't work as hard or smartly as you have could own what you have. This is why Socialism doesn't work. But Dr. King's dream for equality of economic opportunity is America's promise, and this IS what Dr. King spent his Life fighting for not for equal incomes being "distributed". You also apparently agree with it instead of income redistributionist Socialism because you do not practice or believe in income redistributuon. If you did, you'd be redistributing your own income.