Why is uplifting lower species a bad thing?

[IrishNero]

Most societies wouldn't want to be hit by an asteroid or have their planet destroyed.

But it probably happens often in this big galaxy of ours. The ones where a federation ship happens to be visiting are supposed to be saved despite the PD because it's the moral thing to do.

Everyone else is SOL.

True. What if we have been the benefactor of such intervention. Would it be too much to say that perhaps we have even been saved in the past? We'd never know it of course, but it's an interesting notion.