Just in case no one has pointed this out yet, the Palestinian Authority routinely tortures prisoners. Never mind shooting them in the back of the head or dragging them down the street. I'm not too surprised that you and many others choose to ignore this.

Some data can be found here on deaths while in Palestinian custody. Palestinian deaths by Palestinian gunfire are listed here, but you have to pick out the ones that are, or could be political. Many of these are more "ordinary" non-political murders.

Not that Israel doesn't have similar lists, but let's keep our perspective.

And let's not even go into the treatment of prisoners by the governments of other Arab nations.