Who said the Palestinians never built anything?

It's just that they build only things to burn or otherwise destroy;
it's much like sending your children to blow themselves up

Palestinian supporters of the radical Hamas movement burn a Star of David
and a coffin symbolizing the so-called Geneva Initiative peace plan during a
demonstration in the southern Gaza Strip refugee camp of Rafah to mark the
16th anniversary of the creation of their group.
(AFP/Said Khatib)

I know, they can't help it. The Israelis made them do it.