Actually, none of those are the most dangerous things about Kavanaugh. The most concerning thing is his extreme view of shielding POTUSES from legal consequences while in office and the fact that Trump picked him and has stayed with him through scandal when he could have picked another with the same conservative views but minus the odd views on presidential immunity from...everything.
Also, in regard to the partisanship issue, that is based on comments he made in his opening statement. Comments which were almost certainly insisted upon by Trump himself. Trump doesn't just "give away" something as desirable as a SCOTUS seat. No matter how partisan Kavanaugh may or may not be on his own, he has clearly become Trump's bitch. Just think about this: Trump could have cut him loose at any time in this process. Kavanaugh owes him. And that is what should really concern us because when a POTUS no longer has to obey the law, that is when fascism really starts.