Cause and effect. Monterey pine, for example, is one that's always had a problem with growing itself into an early grave in the Sacramento area, and now it's even endangered in its native habitat with pine pitch canker. Don't grow it. I refuse to sell them. The tree is going to die in 15 years or so.
Weeping willows are suitable and beautiful in rural locations.
But because of their invasive root system they should never should be used in a small yard. Or anywhere near sewer or septic lines. Surface roots stretched in all directions, including one headed straight for the foundation, another slightly lifting the driveway and yet another beginning to buckle the city sidewalk. The tree was a liability that would require removal within about five years. Weeping willows are almost never suitable in urban or suburban situations.