AFAIK these things aren't entering through the blockade anyway.
Not right now, but they were largely being let in after inspection before. A few years ago Hamas started policing internal terrorists that would independently launch rockets at Israel. In exchange Israel loosened the rules to allow more goods in quicker through the blockade. At the time it was seen as a sign that maybe Moderates had gained power in Hamas and peace could be possible.
What war crimes did Israel commit again?