Why do you suppose names in politics get corrupted over time?

Why do you suppose names in politics get corrupted over time?

What we now call Libertarians was once called liberal, and before that Whig. In every case the term as invented originally referred to people opposed to centralized power, and was abandoned to people who favored the opposite.

For example America was founded by what we today call libertarians, although before the revolution they called themselves Old Whigs, thereafter Liberals.

https://fee.org/articles/the-libertarian-and-whig-heritage-of-america/

They don't get corrupted people just imagine they change out of romanticism about the past.
Politicians who run under said platform betray and redefine said term once in power to justify reelection.
The ideology itself simply changes and splits into different branches both adhering to the original in different ways.
The languages is redefined by writers to justify and manipulate people into supporting their ideas.
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Why do you suppose names in politics get corrupted over time?
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