Specifically, what part of 'no longer a state' don't you understand? Only states are guaranteed representation in the Congress. If Massachusetts is expelled then they are not in the Union and cannot demand representation in Congress. Where is that forbidden?
You think it's ok for a state to be kicked out against it's will, but wrong to leave voluntarily?
And you think it is OK to leave without the consent of the other states, but not OK for the other states to expel one without its consent. Where is either one forbidden?
You point is EXACTLY why the clause was added to Article V on 15 Sep 1787:
'Mr. Sherman expressed his fears that three fourths of the States might be brought to do things fatal to particular States, as abolishing them altogether or depriving them of their equality in the Senate.'Accordingly,
'M--Sherman moved according to his idea above expressed to annex to the end of the article a further proviso "that no State shall without its consent be affected in its internal police, or deprived of its equal suffrage in the Senate."'Which failed 8-3, then Morris moved that it be changed to,
'"that no State, without its consent shall be deprived of its equal suffrage in the Senate"'Which passed without debate.