Not for Martial Arts purposes. There may be other reasons that they might.
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Certainly. Samurai warriors were martial artists in the truest form of the term.
I don't know of a reason why they have to. I know hundreds of highly skilled martial artists that cannot do a cartwheel.
Mainly ligament and muscle strains, with the odd fractured toe, finger or bruising
Martial arts are no more evil then a gun or a knife, or even a stick. In fact, most true martial artists are recognized more for their contributions to society then their fighting ability. A true martial artist would never consider attacking someone for fun or just because they can. a true martial artist understands martial ethics.
There are too many variables to determine. All martial arts can be quite effective in promoting the overall fitness of an individual. More important is to find one that an individual will practice and continue practicing for a long period of time. Many martial artists live longer then the average population.