They hide under residential neighborhoods, storing their weapons in miles of tunnels and in houses, mosques, sofas — even a child’s bedroom — blurring the boundary between civilians and combatants.
So they fight like US revolutionaries, the insurgents who fought back against nazi invaders in WWII, and pretty much every population that is being overwhelmed by superior numbers during wartime.
Why is that a bad thing when defending against invaders? Like yeah, it would be pretty shitty for invaders to do that, but pretty reasonable as a defensive tactic.