I stick with "what" is happening and try to say light on the crazy "why" stuff especially if you want people to listen to you ..
There is evidence for various weather warfare applications where a government will want to weaken their target before invading. Rainfall can be manipulated for crops (for good and bad; there are winners and losers).
The official stated reason for this is to combat global warming by reflecting sunlight.. I believe it does does temporarily cool things down but we have reports that is causes ozone damage and (you guessed it), just like our drugs it may help one issue but it will bite you in the ass in the long run. Obviously there are a million of other problems caused by the dumping of megatons of aluminum into the global atmosphere.