Earlier quoted context omitted.
There are definitely more than a few partisan court cases, but most of them are very very logical. Even when it's a partisan, ideological split.
Ha. The trick is that what's "logical" and what's "partisan" depend entirely on who is speaking, like how cries of "judicial activism" only ever arise when it's a ruling against a conservative position. If it's a ruling FOR the conservative position, it's obviously logical and sound, and possibly correcting previous evil irrational liberal decisions.
But not every case is divided 5–4 along the line of which party nominated the justice. There are a lot of ideological currents that don't fit cleanly into political parties