Please Donald one question at a time. One thing at a time. Your questions are a bit deep, so can't be answered in a second. First of all, the creation of God was not created to cause harm and spread mischief on land. The creation of God was meant to enjoy eternal hapiness, and they did for a while. It was when they revolted against God that they brought disgraces you mentioned. What you don't understand is that human being was not created in a robot-like manner. We were given the freedom of choice, the free will. The free will if used correctly would mean happiness, if used wrongly would mean disgrace. Have you ever brought a new tv, or a household machine? Ever noticed that the creator of it placed the manual with using instructions together with it inside the box? Why would he do it? It's because he knows best how he made it, so he knows what's the best way to use it. If you follow the instructions of that manual, the machine will benefit you greatly, if not, it will take you longer to get used to it and there is a risk you will accidentaly ruin it, and your whole family will be affected from it.
The same goes for our free will and the way we use it. God gave it to us to use it in our benefit, not in our harm. It was not God's guidance that brought disgrace to mankind, it was the abandonment of God's guidance that brought all of the disgraces. The kingdom of Israel in times of David and Solomon, for example, people rejoiced and enjoyed great benefit from their work, because in those times they were upholding the guidance of God in Torah and Zabur. Only when they left it and started spreading mischief on land the disgraces befell them. Same with muslims-so long as Quran was their constitution and was applied correctly, they enjoyed same as jews in time of David and Solomon-the whole world is familiar with the science, medicine and overall progress in every aspect of life in those times. For instance, I remember attending a class about Omar ibn Khatab (I guess we all know him) and during his ruling (similarily of the rest 3 righteous chalifas) not a single murder, not a single rape, not a single robbery was reported in the whole country. That's what it means to uphold God's law correctly-there is security and peace for all. It was only hundreds of years later when they started abandoning God's law and upholding man-made laws that they gradually came in the state they are today. Don't blame God and don't blame his guidance for the disgraces that humanity suffers, because:"Whatever good reaches you is from God, and whatever evil befalls you is from yourself." (Nisa, 79).
Last but not least, don't say about me what you don't know. I do not read only brother Joseph's studies. Believe it or not, I have read tafsirs and studies from many other scholars, and I have also studied jewish tanakh and christian doctrines. Focusing on islamic studies, you're right, I rely mostly on brother Joseph's works because he: 1.uses Quran to interpret Quran, 2.when asked a question answers with quranic evidence, and 3.doesn't use sources outside quran unless they're well documented. Hope it satisfies your curiosity.
Sorry if I made it too long, I expect to hear from others as well do they agree with me or not.