Oh! I can hear you thinking, especially after that last demonic bruiser broke three feet and picked up speed in the process! Does not seem “Straight” to me … or fair! In wrong Quadrant, right?
On the ‘Dance Floor’ we generally do not Draw Hook or Fade Slice. Thus, we do not deliberately create ‘Curvature’ as we regularly do from everywhere else on course. There are times that we need to putt off the toe or heel. You already know all about that procedure!
When golf balls curve on the ‘Putting Surface’, it is due to the condition of the surface and any one of several of Mother Nature’s other forces or influences. (see ‘slope break, grass and wind’)