Is that they are a hideous pollutant.
They are easy to drop or discard.
It is easy for the wind to snatch them from your hands.
They are easy to be quickly transported via wind or water.
Then, they easily clog stormwater infrastructure.
And then, they never go away, ending up as microscopic bits of pollution swirling in the ocean garbage patches.
Suffice to say that we see a lot of them in our maintenance activities.