The fact is poor people are needed by rich people. and the rich will even live in trouble without the presence of the poor in this world. because there are rich people because there are poor people.
Yes, I agree with you on this very statement of yours, as both the rich and the poor is needed to create balance in the world, because if everybody is rich, who will be the personal drivers, the cleaners and the security guards, and likewise if everybody is poor, who will be the employers, the directors and entrepreneurs, as all need one another for the society to function effectively.
The poor are a threat to tranquility and security in the society and that's why every government needs to tackle poverty as much as they can to beat it to it's barest minimum. Cause where there's so much poverty there bound to be increase in crime rate cause majority of these poor populace may only see crime as means to daily survival.
Generalizing that the poor are threat to the tranquility and security of a society is very unfair and rude if I may say, because we have people who are poor but yet hardworking, respectful and well behaved in the society who never take what is not theirs if not given, because is cause as a result of greed and not being satisfied with what an individual has, of which both the rich & poor steal.