How about addressing the widespread concerns that cause "populism" even if it means setting back your own ulterior agenda? Brexit and immigration is a good example of this. Blair decided mass immigration was a good idea for a number of reasons. At some point they surely realised that although it would provide an economic boost, some people would lose out financially and most did not want significant cultural change i…
Left technocrats see immigration as a human rights issue. Freedom of movement is a well-recognized fundamental human right; your ability to move from Gloucester to London is enshrined in Britain's unwritten constitution. Left technocrats do not see the movement from Paris to London to be any different than the movement from Gloucester to London.
Right technocrats see immigration as a free market issue. One cannot have a truly free market in goods and services unless service providers can freely travel.
So compromising on immigration means compromising on principles. Sometimes it's expedient to do so, but I vote for my representatives based on their principles and how closely they appear to adhere to them.