You see...those people are in a war. It's a war that has been going on ever since 1948, and it has many, many chapters, and many factions are involved. They all arm themselves in whatever way they can and they attack in whatever way they think will work best.

They all regard their opponents as "terrorists". They all regard themselves as justified.

The main difference is this: the powerful (America and Israel) can attack with big air forces, navies, and modern mechanized armies...as well as by more covert and shadowy means. The weaker (the opponents of America and Israel) do not have that luxury. So they attack by what you would regard as "sneaky" means...

Well, that's always what the militarily much weaker side does in this kind of protracted conflict. They do it because to do otherwise would not work.

Example: The Irish came out and fought in the open in the rebellion in Dublin during the WWI years. It didn't work. The British Army crushed them. They then turned to what is called "terrorism" and attacked by stealth...wherever they felt it would hurt the most. That did work. They eventually got the British out of most of Ireland.