This is a case of the pot calling the kettle black. I wish people like Robertson weren't portrayed as a conservative leader.
You are wrong. Robertson is a peaceful man, nothing like Muhammed.
If you know of even a single person treated in the same way by Robertson the way Muhammed treated his enemies - by killing them - I'd like to know!
See also this one: Muhammed's killing of the Meccan Ten
As Muhammad grew in power, he began to use violence to obtain his desires. He ordered the murder of many people. He himself did not go out and commit the murders; he had men who were willing to do his killing for him. This paper deals only with the people Muhammad ordered to be executed (murdered) after Mecca peacefully surrendered to him. During his lifetime, he had a number of people murdered, but in this paper we will examine the 10 people he ordered to be killed the day he took Mecca. He had marched upon Mecca with an army of 10,000 soldiers. These men were tough, dedicated Muslims. The Meccan leaders did not think they could defeat Muhammad's army, so they surrendered to him. Muhammad did not destroy Mecca, or massacre it's inhabitants, but he remembered some of his personal enemies, and ordered their execution. As you will see, Muhammad hated some of these people only because they had mocked him years earlier.
Muhammed kills a Jew who is harmless but voiced opposition to him
In Yathrib, Muhammad began to experience opposition by the Jewish tribes living nearby. For the most part, they rejected his message and Islam. The Jews had several treaties with Muhammad, but that did not mean they were on good terms. One of the Jews, Ka`b bin al-Ashraf, vocally supported the Meccans (Quraysh) against Muhammad. He let it be known that he believed that Muhammad was a phoney, not a prophet at all. Note that I provide a lot of detail; I want to quote the references in full, to provide the proper context. I also quote the sources as they are written in English. Some of the words are arcane, but I want to present the words as they have been translated into English. Ka`b was a Jew. He hated Muhammad. Ka`b never lifted a weapon against Muhammad or any Muslim, he only voiced his opinion against Muhammad, and made up some unsavory poems about Muslim women. Muhammad saw him as a threat, and therefore had him murdered in the night. The Jews around Medina were not under Muhammad's rule; they had only entered into a treaty with the muslims. Muhammad did not have legal right to murder Ka`b, rather he took it upon himself to rid himself of a man who hated him.
Actually, Robertson is being literally correct. Muhammad engaged in the practice of raiding and robbing caravans in order to support his merry band in the early days. This fits the literal definition of "robber and brigand"