Too many questions need to be answered. Because none of us were there, it is hard to tell what really happened. The article mentions a farm with pigs. Most people i know feed pigs left overs(slop) and that is probably what the bear smelled, especially on a hot day...
Were these children being properly supervised? Were the older kids taught not to advance a bear with her cubs? Did he shoot the bear in front of his kids???
Did the bear charge the kids? or was she foraging and the children were in the immediate area.
Was the father trigger happy? I do give him kudos for having called wildlife and report it.
Sea my dear, one has the right to raise food animals for their use and not to feed others or wild life. We humans do come first before wild animals or hungry neighbors. One does not have to excuse a fox for getting into the hen house.

Were the children properly supervised----- Good question in to days world, should have been an adult supervising every thing they did and make sure the kids never had to make decisions on their own. Class 101 how to cripple a future adult.
Did the father shoot the bear in front of his kids. NO, he had them all turn around, place their hands on their ears and covered the dead bear with a tarp so the kids would not see the carnage.

Who gives a rats ass when a mother bear and cubs wander into your yard, they are not there to sell Avon, they are there to eat, anything, they are carnivores you know, sweet little Susie is on a swing set one moment and gone the next.
Mother bear is teaching her baby's how to survive, and at the same time teaching them how to protect their cubs in the future.
Was the father trigger happy, had these been pit bulls running loose in your back yard with a couple of kids on a swing set, do you calmly watch to see if the dogs go for the kids or do you shoot first.??
These were BEARS in the area of children, throwing M&M candy at them will not stop them.
Bears are the only natural enemy to man, they can back track a hiker that is pray, run faster then a horse and are the reason the American Indian made him into a demigod. Bears have been known to go after Kayakers they swim faster then one can paddle.
Sea, I am terrified of bears, I can perhaps reason with a mugger and get away alive, but bears are total killing machines when they are hungry and come out of the woods to find food in an area that people live in.
Mistake the parent made was calling in the police, he could have skinned the bear rolled the pelt in ashes, buried the sucker-----18 months later a nice bear rug.