@Olivier5,
Olivier5 wrote:Wiki's article needs to be corrected. It uses vague wording and provides no reference for its claim.
What is vague about it?
The article you cited keeps switching back and forth between preemptive and preventive self defense. Some of the opposition to preventive self defense might not apply to preemptive self defense.
It looks like the article is saying that
neither view can be said to be the majority view:
"In the present author’s view, it would therefore be more appropriate to argue that the crack in opinio iuris among States has widened, without, however, identifying one approach or the other as the majority view."