Culture matters. You don't exist in a void. You, anyone you live with, anyone who sees your yard, and anyone who hears your views on it all carry a personal culture.
You are responsible for yours and who it infects. Is yours a sustainable one? If not, you're likely programming the world to die off.
It's not only about you. It's about the ripple effects of you and a greater understanding of responsibility in the face of culture as a force to reckon with.
The sum of everyone's yard is still insignificant to the issue. Bugs in yards aren't the bugs that might theoretically matter. You might note the perfect symmetry between the claims "you need a robust population of random bugs in front of your house" and "you need a robust population of random bugs inside of your house". Nobody needs either of those things.
Most of the world is in neither one of those places.