It can be a just cause and terrorism at the same time.

For example, Nelson Mandela and others used textbook terroristic tactics to defeat the SA Apartheid regime, making them terrorists.

Whether or not the objectively just ends justify the means in the cases of South Africa, Palestine, and other oppressed is separate from whether or not the means qualify as terrorism.

For the record, I don’t personally believe that terrorism is justified when there’s any other way to fight back against your oppression, but am with you in not condemning the oppressed when there isn’t.

Also, the military actions of Israel and the US in the Middle East are themselves textbook cases of state terrorism, which this will ALSO be an increase of.