How have you allowed yourself to be educated? If you have let TV, magazines, and the airwaves teach you about health, then there is a good chance what you think is common sense is the need for drugs and surgeries. For example, it would seem reasonable to take aspirin if you have a headache, do arthroscopic surgery every time you hurt your knee, or start using a cpap machine if you can't sleep well at night.
But what if you had a Chiropractic nature-first education? Your common sense would be different. If you had a headache, you would think about getting your neck adjusted to relieve tension on nerves causing the headache, which is much more reasonable then covering it up with a drug (aspirin). This kind of common sense would filter down to all the aches, pains, and injuries of life.
So, look closely..... what a person thinks will greatly determine how well they enjoy health through life. Rarely have I ever seen a situation where a person who has taken lots of drugs or has gotten lots of surgeries is enjoying better health then the person taking a more organic, natural course of...... common sense.