SALT LAKE CITY — Insisting that logging could have cleaned up dead, bug-infested trees that are fueling a Utah wildfire, a Republican state lawmaker blamed federal mismanagement and lawsuits by “tree hugger” environmentalists for the blaze that has burned 13 homes and forced the evacuation of 1,500 people. A conservation group called that contention “shameful” and misleading, saying it fails to take into account climate change and drought. In addition, a U.S.