I really don't think the media has any idea how serious hamstring injuries are. Probably because most of them have never even played high school football. But the key remedy for a bad hamstring is rest, making a big deal about players not practicing isn't logical to these players who are trying to get back to 100% before the season opener.
The hamstring is one of those injuries that, if not treated carefully, could end up being a reoccuring injury throughout the season. Then I bet the media will blame the coaches for rushing these players back on the field, haha.