I certainly am not in favor of censoring historical documents, but as the article mentions, the declaration blames the British for stirring up the "merciless Indian Savages whose known rule of warfare, is an undistinguished destruction of all ages, sexes and conditions". That's a pretty hateful thing to say especially when you realize that colonists killing Native women and children was if anything more common than the reverse.
Satan almight. I'm glad you've looked back on a 240 year old document and determined it to be hateful according to modern societal standards. This is clearly a reasonable position to take because, duh: Fuck context, amirite?. You're doing god's work.
Wow.