Four months ago, after residents and politicians in Indiana and Illinois screamed bloody murder, a train carrying 22,000 gallons of napalm to an Indiana disposal plant was abruptly halted and turned back to California, where the napalm had been modering since the end of the Vietnam War. In July, another toxic waste company won the napalm disposal contract. This time the company, GNI Group, is situated along the Houston Ship Channel, one of the globe's largest and densest concentrations of petrochemical installations. The very same shipment of napalm eased its way into Texas last month with only a briefest flurry of complaint.