Morality from Hamas terrorists

Hello Rabbi Michi!
You are well known for your words about judging a person’s morals according to their own system.
As I understand it, the judgment is made by the man only if the act constitutes a betrayal of his own values.
So, what about the Hamas terrorists?
In my eyes, there is no doubt that they must be eradicated, and this is a murderous and destructive ideology that commands the killing of infidels (including Muslims who are not on the right path) and the supremacy of Islam, etc. ( like Amalek, whose entire foundation is built on evil, they must be killed to the last of them).
But in their eyes they are doing the right thing, they are killing and murdering Jews who “stole and robbed” them of the “holy” land of Palestine.
If so, should they be judged by their method?
Happy and funny Thursday.
With the blessing of the Torah,
The questioner!