JEFFERSON CITY, Mo. (AP) – Some motorcycle enthusiasts are pushing Missouri to repeal its mandatory helmet law, saying helmets don’t prevent deaths and could make riders less safe.  Several motorcyclists told the Senate Transportation Committee on Wednesday that wearing a helmet should be a choice. They said helmets can make it hard to hear sounds on the road and can cause riders to pass out from heat exhaustion. But doctors testified that all riders should have to wear helmets to prevent serious brain injuries and deaths. Missouri requires all motorcycle riders to wear helmets. The bill before the committee would require helmets only for riders younger than 21. The committee will vote on it next week.