They don't have as much left to give as you'd think, and moving huge amounts of heavy weapons takes time and fuel. Keep in mind the most efficient way to deliver weapons would be via cargo ship, and Yemen has that locked down tight.
I recall reading one of Hamas' leaders had survived the Deir Yassin massacre in their youth, and then the next town they moved to also suffered a massacre.
Meanwhile in Israel they were parading around one of the perpetrators of the Deir Yassin massacre while he was telling people to kill every Arab, that if their neighbor was an Arab they should kill him.