That would apply if Reddit were any kind of unmoderated. Most of the communities showing up on the front page have a litany of exacting requirements for content, and sometimes, stuff winds up deleted anyways.
For the posts? Yes. But for the commentary? Only a handful of subs moderate the commentary to any real level - usually ones created in reaction to the ugly nature of their minimally-moderated counterparts. /r/science and /r/canadapolitics are examples of heavily-moderated subs that specifically try to avoid the terrible level of discourse that Reddit is famous for.