Absolutely not, if the Liberals break their promise that's completely on them; just like every promise that every party has made and broken has been solely their responsibility.  The previous government is at fault for pulling this crap to begin with.  Harper literally violated the constitution by trying to push this through behind closed doors.  He literally tried to throw OUR tax dollars at the USA in what can only be thought of as the rawest defence procurement deal in history.  The Liberals are now on the hook for getting us out of Harper's mess.  They've promised to do so, if they don't follow-through on that promise, in my book they're as guilty as the Conservatives.