Haphazard Bombardment says:
When Haphazard Bombardment enters the battlefield, choose four nonenchantment permanents you don't control and put an aim counter on each of them.
At the beginning of your end step, if two or more permanents you don't control have an aim counter on them, destroy one of those permanents at random.
Note the last line says "have an aim counter". It doesn't say "have at least one aim counter".
Does this mean that if a target somehow gains two aim counters (e.g. via proliferate, or because the creature gained more aim counters from Hankyu), it cannot be destroyed by Haphazard Bombardment?