The last two heres are actually hears, as in "hear hear" as in "I heartily agree" or words to that effect. So that means the people that chime in "hear hear" agree that it should all be left in the AA room.
"Hear hear" in my mind is more of a Brit thing. I have seen their parliament make arguments and when someone agrees with someone's argument, they respond "hear hear". It is used much more in the eastern USA than the rest of America in my experience, likely because there is still much more British influence in the culture there.
"Hear hear" can also be used sarcastically, as in "you're full of dog****".
Here is a good link on it:
Hear hear