The caution wall

I read somewhere that some people pass through your life for a reason. Let them leave, the purpose is served. I beg to differ as I see no purpose except that it left a huge pile of garbage called hatred which had not been rinsed off even with years of invested time. No good happened while they existed inclusive of waste of men, money, machinery and material in business terms and misleading moments in actual terms. I would like to hunt for an answer on why at all this has to happen. Whether or not I received an answer yet, I learned “Caution”. Caution is a virtual circular wall around within a 10 to 50-meter radius having large number of filters to finally allow any one near the acknowledgment zone. I am glad, one good outcome of the garbage was creation of this wall which made world a better place to live.