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.
It’s an exact science, don’t let anyone else tell you otherwise.