I agree with all of the above..
Stay out of "bad" areas... and the risk level is as low, or lower than many/most places in the US..
A farm where bad guys know that there are numerous armed people running around isnt a priority target... if bad guys do decide to attack a game farm while there are hunters on the property, their victim selection process is clearly flawed and they should probably have their predator cards revoked..
Ive taken my wife and children to South Africa and felt perfectly secure.. Im taking my wife and one of our children back to South Africa again in July... in addition to going to the NW Province to hunt for a week, we're going to spend a week in Cape Town on our own.. I've rented a car.. we'll self drive everywhere we want to go.. we're in a hotel down near the water, will be driving all over the city, out into the rural areas around the city, etc.. and I am 100% comfortable in doing that..
Just take the right precautions, make sure you have an idea where the places you need to avoid are, and act responsibly.. and chances are far better that you and your family will be safer, than if you were spending the same amount of time in Chicago, DC, Detroit, or Memphis...
FWIW, I am a former major metro area cop and former soldier.. I have worked in the "security" industry in one way, shape or form for the better part of the last 30 years... I am extremely security conscious... and again, have zero concerns about taking my wife and kids to South Africa right now...