Oh, of course - I'm glad you added this.
History is absolutely cluttered with examples like this! This is everywhere.
There's evidence of weaknesses in morality of many figures who were great leaders and did a lot of good; even when one of their main selling points is their strong morality - Martin Luther King, Jr., Mohandas Gandhi, and others. I won't list them all.
I think with some - like these two; they should still be admired for the good they've done. Yet we shouldn't be complacent, not sure if that's the right word... We shouldn't ever hide their faults or give them any leniency in that - as we judge them through history's lens'.
However in some cases it's worse. The problem is that when someone is in power, sometimes because it's easier to get away with stuff, they can feed their vices more than they should. There are also people who I think have very little value in-so-far as what they've contributed. Often these individuals are controversial and have a lot of strong support and a lot of real detractors.
Sigmund Freud for instance, I have very little respect for because, though he was a pioneer (and thus should be allowed some room for mistakes) in his field, I think he was so off on his understanding of human nature as to where I don't want to read his work because I feel like I'm reading someone who actually really needed help, not someone who could give it. His theories were utterly un-scientific and while he may have given some benefit to some; he also gave terribly bad advice to others (such as he told two of his patients who were each married but having an affair together to divorce their spouses and get married to each other - they did but had divorced each other after 1 year, and the woman left with a good position but the man with almost nothing.) Another thing about Freud is that he was addicted to cocaine for 20 years - as far as I know this is a fact - and smoked 20 cigars a day for a similar amount of time. Now I am not against everyone who smokes cigars - but they are nasty to go down generally, and even to smoke one a day I would consider a huge excess. It chokes the prana, etc...
I don't need everyone I will consider reading to be a saint, but I do want them to have a certain measure of having-their-lives going straight; some measure of understanding of their own life and body, and the more so the better. If anyone is going to rise very high on my list, as many have done, they have to have these qualities. It's not that I think someone who has a habit I wouldn't condone for myself (or my children....etc..) shouldn't be heard, or shouldn't write - not at all. However, it does have an effect... and if it's true Freud was addicted to cocaine for many years, as I believe it is, the effect is rather pronounced. Especially with a mix of cocaine and excessive smoking, this inevitably produces a certain derangement on the mind. And about Freud, I don't find this unbelievable in the least. I have always felt that unhealthiness about him, in most of what he did.
I am not on a vendetta against him, and I know he has his own place and contributed a lot, and had good thoughts and ideas too; and helped psychology along. I cannot estimate how much good and how much detriment he has done to psychology and society, and it's not so important. When I compare it to Walt Whitman, however, for example; there is no comparison! Walt Whitman was strong and wholesome all the way through - insightful, poetic, courageous, perceptive, jovial; through and through he had good qualities and is a man to admire. As he spoke of the beauty and health of the body, I admired him, and when he said that he discovered the best way to quickly achieve perfect health is to live in nature, he speaks with some measure of authority and it also speaks to my experience. Enjoying nature becomes a little bit different when you must carry your habits of addictive drugs with you, and it also becomes distorted. Everything does.
In the cases of M.L. King Jr. and Gandhi, the case is much different. I believe M.L. King Jr. had some infidelity issues. These do not detract greatly from the unmistakable and perhaps immeasurable good he had done.

