The Annoying Red Planet - S1-E13
Factual error: Golf balls did not have inverted dimples until 1905, the exterior covers were dark, rougher and probably with an interior of wood. The white golf balls used by Murdock to illustrate a point had not been invented at that time.
Answer: It's certainly a personal choice about using one, and probably similar to how some people refuse to wear a helmet or forego other safety equipment. Most bells and horns on bikes are not very loud and probably wouldn't be heard in busy traffic, making them mostly ineffective. Murdoch would likely still yell, even if he had a bell or horn.
raywest ★