If a Rebublican changes ship and becomes a Democrat, then the "truth" about what that person is has shifted. If I believe in some Democratic principles and some Rebuplican principles (which is in fact the case), then am "I" a Democrat or a Republican?
Context again.
Democrats differ from Republicans based on their core principles of how large a role Government plays in society.
The context of the above descriptions is differentiating one party from another. In other words: group identity.
You, as one person, may embrace a core principle one day and replace it with its opposite the next if persuaded to do so based on your values. You have the same fingerprints, blood type, facial features, DNA and shoe size no matter which political party you join.
The context of that is individual identity.
Now, are you going to pretend there is no difference in contexts?
You continue to play the game of context dropping, shifting and deflection.