They were similarly "butchered" before the election that gave them a majority. If getting "butchered" by the MSM correlates with success, why should they care?
Because the electorate that turns out in 2016 will be different than 2014. The GOP is playing right into the Left's hand if they go for a total Gov't shutdown - It's taken a year to recover from that 'branding' and now you're going to walk right back into the same $#!+ and get branded as 'can't govern' by the MSM, and destined to be a minority party forever.