not entirely true, hunting these animals for sport is very much illegal, and they are sure to be tracking these grizzly's so that makes it much harder for them to be poached. the reason this was bad is because a lot of people flocked to the bears to get pictures and to see the bears. this drives the bears towards roads and such which is a danger for them. the article states this.
grizzly bears are already kind of endangered, but there is no endangered list for rare colorations of animals. white grizzly bears are rare, and even if this white grizzly has babies, they most likely wont be even partly white.