"So why do you all only attack the Tories over immigration?"

.. possibly because...
.. although any sensible citizen recognises that there would be a theoretical finite space for occupants on this island,
and accept a rational informed debate on the subject;

only the tories and even further right wing zealots
are at this present time cynically manipulating it as a scare tactic issue
to panic the voting population into pernicious paranoid xenophobia... 😣