Many bad things would stop occuring if 99% listened to Jesus--Aids may never have started --Gods people dont take blood transfusions--his word is clear--Abstain from blood. Here is a simple teaching of Jesus--Keep on seeking first the kingdom and his( Jehovah) righteousness, and all will be added.
There still would be:
Natural disasters.
Thousands of diseases spread from these natural disasters or maybe just from swimming with other folks or sharing the same toothpaste (Jesus was a big fan of sharing afterall).
Food poisoning.
Diarrhea.
Colds/Flu.
Mental illness.
Animal attacks (that may bring disease).
Car accidents.
Many, many more things that harms a person. If 99% of people listened to Jesus they'd be deaf.