There were Yidden who weren’t afraid of Haman’s decree.  They said, “We have a sister, Esther, in the palace.  She will take care of us.”

Therefore, the Gemara (Megillah 15:) tells us that one of the reasons Esther invited Haman to her party was so people would lose hope in her and instead place their trust in Hashem. Because faith in Hashem was what was needed to merit salvation. ~ R’ Elimelech Biderman