The Etymology of the word 有的
If you take an English sentence like:

There are people who believe the earth is flat.

We can see a similar phenomenon to that in Chinese. The phrasing of there are tells us that it is not everybody who believes the earth is flat but that some people hold this conviction.
Likewise, 有的 plays a similar role. You already know that 有 expresses something akin to, &quot;have&quot; or &quot;has.&quot; If you treat 有的 like &quot;there are&quot; from the example sentence above it is easy to see how the language works similarly to English.