The party is railroaded into a quest they don't want and one, as they later find out, they don't want to complete.
It's to prevent the player 
from ignoring the quest.
.ذلك لمنع اللاعب من تجاهل المهمة
Damit die Spieler die Quest
nicht ignorieren.
Es para evitar que ignoremos la misión.
On ne peut pas ignorer la quête.
Per impedire al giocatore di ignorare la missione.
É para evitar que o
jogador desvie da missão.
Наверное, чтобы не пропускали квест.