My understanding is they succeeded partly by being the bigger force. You can do that when the enemy is a small local police force with the weapons of that time. However it’s not the same when it’s a larger militarized federal force that is already claiming “total Immunity”.

If they have the overwhelming force and believe they have no limits, escalating will only escalate their response.

But legally they don’t have “total immunity”. Legally there are limitations. Legally there are civil rights. Pursuing it through the courts is slow and uncertain, but much more likely to succeed