Abdu'l-Baha also upholds the traditions, "I am a Prophet by the sword" and, "I am commanded to threaten the lives of the people until they say, ‘There is none other God but God’" which he interprets to be a reference to idol worshippers of the time of Muhammad and then attempts to justify them in my view.Here's what I found on Wikipedia...
The Baháʼí Faith teaches that Muhammad was a man of peace. On the occasions when he did fight, he only did so in order to defend himself and his followers from the hostile pagan Arab tribes who inhabited the Arabian Peninsula in his time.[11] ʻAbdu'l-Bahá claimed that "Muhammad never fought against the Christians".[12]ʻAbdu'l-Bahá taught that some stories about the teachings, deeds and sayings of Muhammad as described in certain hadith which he perceived to be negative, were fabricated due to "fanaticism", "ignorance" or "enmity". He told that most of those who narrated such stories were either members of the "clergy", "antagonistic" or "ignorant Muslims who repeated unfounded traditions about Muhammad which they ignorantly believed to be to His praise." Thus, he says, "some benighted Muslims made His polygamy the pivot of their praises".While disregarding some hadith about Muhammad as fabrications and exaggerations with no foundation, ʻAbdu'l-Bahá accepted the authenticity of others. For example, traditions about Muhammad's friendly treatment of the Christians of Najran of whom Muhammad is said to have proclaimed: "If any one infringes their rights, I myself will be his enemy, and in the presence of God I will bring a charge against him." According to Baháʼí belief, in this time Muslims and Christians lived in harmony with each other, however, "after a certain time", due to 'the transgression of both the Muhammadans and the Christians, hatred and enmity arose between them.'[12]
'While 44 it is a sacred obligation devolving on every conscientious believer in the unity of God to guide mankind to the truth, the Traditions “I am a Prophet by the sword” and “I am commanded to threaten the lives of the people until they say, ‘There is none other God but God’” referred to the idolaters of the Days of Ignorance, who in their blindness and bestiality had sunk below the level of human beings.'
Source: Bahá'í Reference Library - The Secret of Divine Civilization, Pages 41-60
An additional point of interest is that the first tradition, "I am a Prophet by the sword" does not as far as I'm aware appear in any known hadith before the time of Abdul-Baha, so Baha'i are stuck believing a hadith about Muhammad that even hadith accepting Muslims don't believe in in my view.