I often see posts that are 95% on topic, but 5% is a TOS violation of some kind. I try to stay within TOS, so I often re-read before submitting, to see if the entire post follows TOS.
When my post gets removed, I can usually figure out which part was off topic.
"It is easier to fool someone, than to convince them they have been fooled."
For those that don't get it, it means that people need to be more careful, and do good due diligence...