That's factually incorrect. There are things that go in/out of Gaza but in very limited supply.
The blockade (why is it in quotes?) was created more than 10 years ago for political reasons as a way to pressure the people of Gaza to turn against Hamas. Ever since, it achieved the exact opposite. To remind you, ~2 million people have been living under this siege since then.
Don't fool your self - putting 2 million people under siege is not self protection.
PS - the US definition for terrorism is "the unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims.". Just saying.