I agree there should be some countermeasures for malicious content such as viruses, spam or phishing attacks. However what consists of inappropriate content is entirely subjective and that is the problem. They're should be a place for everyone. However, I would not be against a "clean" front-end for steemit that moderates "offensive" content. I just don't think the flagging should be baked into the block-chain. This is antithetical to steemits claim of free speech protection.