Distinguishing between factual and opinion statements in the US news

1. some respondents will not answer consistently with pew's definitions (those familiar with fake news and statistics will suppose their responses will be used to misrepresent reality, and respond based on perceived accuracy)
2. some demographics (like me) will not respond at all for similar reasons.
3. they're using a niche/uncommon definition of fact and opinion
   a) if they don't tell people, that will skew the results
   b) if they do tell people, it will probably confuse them and produce inconsistent results
   c) the definition itself is questionable and depends on such a thing as "objective evidence", which given they're couching this in philosophical terms is arguably impossible to ascertain.
4. the statements used are not all categorized cleanly by their own definitions
5. the poll was set up to contrast between republicans and democrats, (results showing a bias on one side), but the amount of statements and their degree of popularity/bias in each demographic is not equal - which biases the resulting data (even if attempts are made to balance it out after the fact with math).

Because of the above, the data from this poll is unreliable, lacks meaning or significance except to indicate that pew is (at best) trying to capitalize on the current divisiveness between republicans and democrats for clicks, or (at worst) intentionally trying to portray republicans as less intelligent to democrat readers to further dehumanize them.

edit: if any one of the above arguments is true, it implies to me that the resulting data (especially conclusions based upon it) are unreliable.

About definitions:

A dictionary reading for fact and opinion shows them as (paraphrasing) "something that is true" and "a personally held belief" respectively. I would argue these are the definitions most people have in mind for these two terms. There are other definitions which are specific to the field of philosophy and logic, which match what Pew is using, where a fact can be either true or false but is able to be proved or disproved, and an opinion is any belief or judgment without "sufficient grounds" to produce complete certainty. What are "sufficient grounds"? Well that all depends on what works for you.

Take for example my above claim about the usefulness of the data from the poll, which is based on five arguments. Are any of those arguments able to be proved? Is my claim alone able to be proved? If we for example embedded an unaffiliated observer who is neither republican, democrat, nor associated with pew or anyone who has a negative bias against pew, who noted how often responded refused to answer and asked why, would that provide "objective evidence" proving or disproving my second argument? If I say right here and now that I would abstain from responding to such a poll, does the fact that I exist prove or disprove the argument?