There is a great difference between an emotion such as love, or the enjoyment of music, drugs from a doctor and gravity. The first two are extremely subjective. It changes from person to person. The woman that you love others will not, the music you like may will seem like rubbish to others.
Certainly, those scientists in love and listening to music do not tell everyone that everyone else must love their wife and listen to their music.
On the other hand, choosing a doctor is based on facts, not subjective emotions. A doctor is accredited when he can satisfy strict criterion in regards to his criminal history and his medical knowledge. I chose my doctor on the basis of advice from previous patients who were friends of mine, whom I trust from previous experience. Certainly, I know of people that have done research of medicines before taking them, including myself. That's not trust and faith, that is conviction in knowledge and experience.
As for gravity, it explains why the satellites stay where they are and why I don't just float away from earth should I jump up. It explains why my ball comes back to me when I throw it. That's pretty good coverage for just one scientific theory. I test it whenever I play ball sports, so I am pretty satisfied with the current gravity theory.