Are you seriously that dense?
See that caution sign on the bottom right-hand side of every post? Yeah, that's the 'report post' button. If you see a member spamming, or just not following any part of the AUP (Repeatedly. First offenses are typically overlooked unless a mod or member simply wants to guide that member in the right direction to avoid further inadvertent disregard for the AUP) it's your choice to report said post and let the staff take action. If you choose not to report the post because "it isn't your job" then you have, under absolutely no circumstances, to complain, moan, or even bitch about the way another member carries themselves about. Simple as.
Think of it as voting; if you chose not to vote, then in theory you have no right to complain about the President, Mayor, or Governor. Why? Because you didn't grasp the opportunity of being involved.