If you follow my comment history in this thread (not that you want to), I am not necessarily arguing against the similarities. My point is that the similarities are very common. If I wanted to argue against the similarities, I would highlight all the differences, because there are as many differences as there are similarities.
I agree with you that copyright cases are won/settled in situations with less similarity. This is an assumption, but would guess the reason for that is the people who make the final decision - a jury or judge - do not have the musical knowledge required to understand how often chords, rhythms, melodies etc. are repeated. If they understood that a 1, 4, 5 progression is one of the most common, and there are only 12 notes to choose as the root key signature, and that major and minor scales are the most common, etc., if they were presented with data showing this, they might rule differently.
Do I think the songs are very similar? Yes. My point is that if artists resort to litigation every time two songs are similar, we would need a separate legal system to handle the case load. And the artists themselves (Artikal for example) would be hypocritical to overlook the similarities between their songs and others that came before. Rihanna released a song in 2008 called "Life Your Life". Should she sue Artikal for ripping off the title? Where do we draw the line between "influence" and "plagiarism" with something so subjective as music?