Why are Trolls not blocked

In Internet slang, a troll is a person who starts quarrels or upsets people on the Internet to distract and sow discord by posting inflammatory and digressive, extraneous, or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the intent of provoking readers into displaying emotional responses and normalizing tangential discussion, whether for the troll's amusement or a specific gain.

The forum poobahs won’t block out the repeaters, but we can automatically and instinctively ignore them, so we don’t feed the troll to skip the bull💩