Commenting here is a privilege, not a right. If you disagree and it is factual to the commenters best knowledge, it will be approved. Spam is not posted unless I don't catch it. If you are profane or are just tying to be nasty because you disagree and do it with hate speech, you may be censored unless you prove a very good point that the other readers can benefit from.
I try not to knowingly print lies or untruths in my blog, unless I'm pointing to the person who told the lie to highlight their point or lack of honesty.