It's really a bigger picture issue, but I think you already know the answers.
People prefer their own group. People who think, act, dress, believe, behave, etc. like they do. Just like you. You're obviously Muslim so you're defending your own group.
You're accepting of white Christians because your group is not the dominant group right now in the US, so you have to be. However, if the situation were reversed, your group likely wouldn't be as accepting. This is evidenced by the limited number of churches, Buddhist temples, synagogues, etc throughout the Islamic world.
Right now, you get the best of both worlds. You get to diversify and spread your beliefs, culture, and religion throughout the world while not allowing the same to happen throughout Muslim countries, as the relationship between the West and Islam is not reciprocal. You get to keep Muslim countries pure, yet the more power your group gains in the West, the less power other groups, including white Christians, have.
While the vast majority of all people from all groups, including Muslims, do not commit crime, the fear is that the average person does not typically end up having much power. Power is held by those smart/strong/ambitious enough to get it. So, if Muslims increase in power, the fear is that the extremist element, despite it not being the majority, will wield a disproportionate amount of power over the US. This is what happened in many Muslim countries, including Iran, and Americans overwhelmingly do not want to live this way.
I'm trying to answer the questions you posed. If you only want to converse with clubdeac, that's fine, but it may be better not to post publicly.