If obeying the law of the land is Jewish law, why is the Torah full of stories of Jews not obeying the law of the land?

I know dina de-malkhuta dina is a thing, obey the laws of the place you live in. But it doesn’t add up with Torah, or any part of of Jewish history, for example:

Haman then said to King Ahasuerus, “There is a certain people, scattered and dispersed among the other peoples in all the provinces of your realm, whose laws are different from those of any other people and who do not obey the king’s laws; and it is not in Your Majesty’s interest to tolerate them.

What happened to dina de-malkhuta dina? Why couldn’t Mordecai just obey the law and bow to Haman so he wouldn’t get upset?

When he (Mattityahu) had finished speaking, a Jew came forward in the sight of all to offer sacrifice on the altar, according to the king’s command. When Mattityahu saw it, he gave vent to righteous anger; he ran and slaughtered him on the altar.

And in the Hanukkah story, Mattityahu kills a Jew for obeying the law, which was to leave a sacrifice. + murder is not Pikuach nefesh

It doesn’t add up with “obey the law of the land”, why is it broken so much in the Torah even though it’s law? And if it’s praised during holidays like Channukah and Purim, why is it even a law? I’m not Jewish so it’s not my job to question Jewish law, but I’m really confused