Morales ability to increase social spending has been directly linked to the increased value of Bolivia's natural resources, and not necessarily to Morales indigenous background.
For many indigenous groups, this economic bonanza has come at an extremely high cost. Morales has led the careless extraction of natural gas, along with an increase in mining activities, at the expense of Bolivia's rich natural environment. Indigenous groups have also stood against Morales over his disregard for expanding indigenous land rights. 
Moreover, it is not a requirement for a leader to be indigenous in order to care about a country's indigenous population.