You can set "showdead" in your profile settings to "Yes" to view flagged comments.
Go to your settings and turn on 'showdead'.
Thank you.
Really, the comment is underwhelming. Seems silly to hide it after it's grey already and annotated with all kinds of warnings.
It's to discourage particularly crappy comments from starting pointless discussions. You can't reply to flagged comments but in this case the repliers were faster than the flaggers. It's always better to flag flamemaking comments than to reply to them.