Our planet’s view of the sun is critical to life, obviously, but equally critical is that it’s a shielded view.
Remember CHONPS — the acronym you learned in high school to remember the elements most important for life?
Neither the Earth nor the human race is allowably described as unusual, because that could suggest (shudder) intelligent design.
“Not exactly proof” of extraterrestrial life, they say? It’s not a “proof” at all.
The discovery of ETs would not undermine the case for the design of terrestrial life one bit. The situation for Darwinists is very different.