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[Star Wars] Why are Tusken Raiders such assholes? Why don't the people of Tatooine fight back?

So I was just wondering about Tusken Raiders earlier today. They torture Anakin's mom to death for no reason and whenever we see them in the movies, they're being assholes. I looked through Wookiepiedia but it didn't really tell me much. 

Is there a reason Tusken Raiders are such assholes? How come the people of Tatooine don't get together in a big angry mob and wipe them out like Anakin did?
gpt
Basically, Tatooine was once a lush, beautiful planet before it got glassed by the Rakata during the Infinite War. After that, pretty much all life adapted to the harsh conditions and things were generally peaceful until a few thousand years later when the Republic discovered it. They disrupted the Tusken water supplies and fucked with their territory, so the Raiders declared war.

So, in short, they had their own planet and were surviving okay there, until some ugly looking space people moved in, started taking up their territory, using up their resources, and taking over the few livable places on Tatooine. They also wrecked Tusken holy sites.

In their mind, they're not being assholes. They're fighting a war against an invading alien force that's been trying to take their stuff for thousands of years. Anakin wiped out one small village, there's thousands of Sand People out there and they're all in a better condition to fight than the colonists. They've also got a better grasp of tactics: If an army was raised to fight them, then they'd have a force go and destroy the human homes while the army was romping around for them.

They know the planet better, their mounts don't break down, they can get around faster... As it is now, the Raiders are losing the 'war' because they haven't formed a single army and the settlers have had outside help. They kill a farm or two at a time. However, if prompted, they'd probably form an army and be a threat to entire cities.