Saying that your enemy "plans" to do something, is never justification for mass murdering civilians. It's interesting that this is basically the same playbook Zionists are currently using. Hurl some accusations, then start killing civilians.

Haman’s plans weren’t theoretical. He had taken steps to put them into action, just like Iran has taken steps for decades in attacking Israel. Likewise, the people that were killed weren’t civilians. They were supporters of Haman. Undoubtedly, some innocent people were killed. That’s just how war works.