If Mexico is at all like the US there should be 1 in 10000 daily newspaper journalists among the population. Add maybe as many for all other forms of journalism. Then they are just twice as likely to die then the average Mexican as a result of the drug war. Given that even the cartels probably kill more working age people then children and retirees the rate might be totally normal. The shocking thing is however how many people are killed in total in Mexico. Whatever their line of work