"not sure about that.....if so why would stores feel the need to put a placard outside saying they had nothing to do with the groups seeking money or signatures"
The same reason there's a disclaimer on DVDs saying that the views expressed in the commentary don't reflect those of the studio. It's a safety net for them- they can't be accused of being for or against any particular organization or group, and it also absolves them of responsibility if the group expresses a view that may offend.
In this case, I'm not sure I agree with the ruling. It's Target's property and if customers were feeling harassed or the flow of traffic was impeded, it's certainly within their right to tell them to leave.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."