With all respect to industriousness and a personal work ethic that detest the entire idea of living on handouts, I have to say that the government is not only unjustifiably punishing victims of it's own poor economic plans, but also that this is an unconstitutional violation of human rights with regards to Tanzanian's freedom of movement within the country.
You can tell a lot about a society by how it treats the poorest of the poor. I am sure even in an environment with 1% unemployment you will still find people begging, but if adequate standards of human rights cannot be maintained during the entire exercise then it is better not to conduct the exercise at all.
For example, how do you tell ombaomba from non-omba omba? How do you ensure the exercise is meaningful and they won't be back in a matter of weeks? What if they say they are Tanzanian citizens, exercizing their freedom of movement in the republic and soliciting help peacefully from sympathetic people without breaking any constitutionaly sound law? Under what law exactly are they "internally displaced"? Isn't "Uzembe and Uzururaji" too vague and potentially unconstitutional?
I say if the government wants to solve this problem it has to look at the root of the problem.Poverty in rural Tanzania, low GDP per capita, low productivity, poor social services etc.
Once you solve these problems, the influx of ombaomba would not be as pandemic and then the government can genuinely make a case, although indeed the spectre of the thorn of unconstitutionality will linger.