A Small White Butterfly

​A small white butterfly was dancing all around me one day last week. I watched it and tried to photograph it (an impossible task!). In doing so I realized that what it was doing was laying eggs in the weeds of my yard. Now we can’t mow that section of grass for a while. 
I looked online and identified the butterfly as a cabbage white. On further reading, I learned that this species is considered invasive. Why is it considered invasive? What plant or animal did it displace? Or is it just because we humans don’t like to see holes in our cabbage?
I will leave it be anyway. I am not trying to grow a vegetable garden and the caterpillars will be good for our neighborhood birds. Besides, I like butterflies.
And for what it’s worth, I don’t mind eating cabbage with holes in it.