First, the judges husband was an ASSASSINATION, not a "protest" that got out of hand. I can't believe you're even comparing the two.
Second, not one person here has said the couple didn't have the right to protect their property. I believe some even said (and I agree with them) that they have the right to have weapons and carry them on their property to protect themselves and their property.
Where they get into trouble however is aiming the loaded weapons at PEOPLE who are NOT a direct threat to them. Could the people they were aiming at have become direct threats? Yes. But until that happens, they should not aim their weapons.
Would you be ok with someone aiming a weapon at you if you're walking down the street (even a "private" street, even though that's up for debate also)?