Walkout should not hinder continuation of meeting

Dear Editor,
It has to be wondered: if a meeting is fully and legally convened, and agenda items are being dealt with, but as soon as an unfavourable item on the agenda comes up, one section walks out or logs out, cannot the meeting continue for lack of quorum? And does it have to be aborted? Why is this so?
The meeting was legally called to order, why can’t it continue?
The meeting has a legal chair, so discussions and decisions have to be seen as legal and binding.
It is my opinion that once the meeting was properly called to order in keeping with all protocols, the walking out of some should not hinder its continuation.
The options at the disposal of the chair should be invoked, so legitimate business is not held up.

Shamshun Mohamed