So trademarks and branding are 100% intellectual property. They obviously serve a valuable purpose and a company is absolutely within their rights to defend that property. I'm glad we agree.
Also:
Merriam-Webster dictionary, Plagiarism:
(transitive verb): to steal and pass off the ideas or words of another as one's own : use another's production without crediting the source.
(Intransitive verb) : to commit literary theft : present as new and original an idea or product derived from an existing source
Plagiarism is a violation of intellectual property, you can not choose to believe in one without the other, that's asinine.