I think this is one of the main reasons and rationale. The other is that many Christians are unfamiliar with these scriptures and have no idea what the says or means. They like the warm and fuzzy "Jesus loves me" stuff and ignore the pain and evil that god demanded. When you bring up these issues up they block their ears like 5 yr old and sing nah nah nah.
Thanks everyone for all your great replies. I've always wondered why fundie christians ignored all the evil passages in the bible but then bashed other faiths such as the muslim faith.