The short answer
No one has to. Statins are usually offered first because they're cheap and have the strongest proof of preventing heart attacks and strokes.
Whether one makes sense for you depends on your LDL and your overall risk. If the choice isn't clear, a coronary calcium scan or Lp(a) test can help, and other medicines can step in if statins don't suit you.
Source: 2018 AHA/ACC cholesterol guideline; CTT Collaboration, Lancet 2010.