This is necessary to ensure that there is no transfer of weaponry to the Palestinians as they have used and will use advanced weapons against the civilian population of Israel.
Those shipping such goods/humanitarian aid to Gaza are welcomed by the IDF to observe the process as well as to witness the actual receipt of their contributions by Gaza.
In fact, Israel, despite the naval blockade, allows THOUSANDS OF TONS of aid and food into Gaza DAILY..
"To that end, the White House announced Wednesday that it was contributing an additional $400 million to Palestinians. While the largest chunk is allocated for mortgage assistance in the West Bank, several smaller projects were dedicated to rebuilding schools, agriculture facilities and sewage systems in Gaza".
All the while, the total of foreclosures for American families nationwide in May totaled "322,920 foreclosure filings"counted throughout the month, for a rate of one in every 400 U.S. households receiving a filing".