I've probably commented 300 times and at least 100 were rejected. I am rarely rejected when commenting on other websites as I don't use crude language. KSL censors with the best of them, particularly if you are conservative or in opposition to one of their articles then there is a good chance your comment will be rejected.
I can comment on www.desnews.com without issue and don't recall ever being rejected.
KSL also won't often check their classifieds for fraudulent postings.
I've about given up on their comment section.