For example. I am human. I can be nothing but human. So therefore I can change. Having been furry or otherkin at one point does not make me not human, since that implies that our minds have some sort of mystical ability to control reality outside of their influence on the body. However, we do have minds, since the contrary view implies that our muscles have some sort of mystical ability to act in an organized fashion without the mind.
Another example. Voters change. They vote for different people. Different parties. Different policies. If you examine socioeconomic, you will find that change is a part of nature. If you examine yourself, you will find that change is a part of yourself.
Partly crossposted to debate_classics, the rest snipped.