Sam: Yankel is correct in that in an existing marriage an individual spouse does not have the unilateral right to terminate the marriage even if he/she no longer wants to be married to his/her spouse for reasons not considered justifiable under Jewish Law. Jewish Law is very clear that a marriage can only be unilaterally terminated for cause.
Why did RG reinforce the prohibition to divorce ba’al korchah? According to your position it should have been okay for either spouse who wanted to divorce to have the right to do so even “if she’s being silly in throwing away the marriage” as you put it.