"It must be understood that Mohammed was involved in warfare and that's how he captured Mecca - and not at the first attempt. So imagine, if the leader was violent, what else would its followers be?" -reply: The most peaceful conquer ever in the history of mankind is Mecca's conquer, please study the history, when prophet mohammad(phuh) came back victoriously to the Mecca he never took revenge he forgave every one of the meccans even though meccans plotted to kill prophet mohammad(pbuh). Prophet mohammad(pbuh) strictly given the instructions during the warfare: 1. Do not kill the women 2. Do not kill the children 3. Do not kill the elderly 4. do not kill the animals 5. do not put any thing on fire.
Please look at the history and study with and independent unbiased mind, everything will be cleared. If Allah wants to Guide no body can stop him from getting guidance, if Allah does not want to guide no body can get him to the point seeking guidance.