Sometimes, when they're genuine newbies to the board, of course they're welcome. And no one will disrespect their opinion just because they're new.
BUT, have you ever noticed that when the poster is supposedly "new" and is making their first post, and post some ludicrous, rude insult up, mostly they're a member, wanting to post something attacking others, but are too afraid to post under their proper name.
So why should we respect THAT?!