Question: What I mean is that is it more dangerous than other contact sports that aren't martial arts? Such as Football, Soccer, Basketball, etc...

And if yes, why?

Answer: 
I'm not sure that your statement about the safety of boxing is generally accepted.

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> ["There is absolutely no way you can make boxing safe," said Nelson Richards, MD, a delegate from the American Academy of Neurology who proposed the original resolution to ban the sport in 1983.](https://www.ama-assn.org/amednews/2002/07/08/hlsb0708.htm)
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[The BBC reported](http://www.bbc.co.uk/health/physical_health/conditions/boxing.shtml)

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> According to brain surgeons, over 80 per cent of professional boxers have serious brain scarring on MRI scans. The evidence for harm or cumulative brain damage to amateur boxers is less clear.
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Boxing advocates point out that amateur boxing [has fewer injuries](http://www.boxinggyms.com/gladiator/newpaper/safe.htm) than soccer, gymnastics, etc. However that source doesn't cite how they measure "fewer injuries", and doesn't state whether they count long term damage to the brain. [There is some evidence that even amateur boxing can cause brain damage.](http://www.science20.com/news_articles/even_amateur_boxing_can_cause_brain_damage-89512)

Ultimately, you may want to look at a source which [compares injury rates](http://www.thecni.org/reviews/11-1-p35-gerberkozora.htm). A quick google search suggests that [football and soccer](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2267335/) have the highest injury rate/hour practiced. But that doesn't address the severity or long term consequences of those injuries.
The short answer is yes. The very point of the sport is to do damage to your opponent. That being said, the chances of you actually breaking something (apart from your nose) is pretty rare. The only particularly dangerous thing that can happen to you in boxing or kickboxing is a concussion, which can and probably will cause scarring of the brain and make you "punch drunk" after a few years.

So yes, boxing and kickboxing is pretty dangerous, but the types of serious injury is limited to your brain unless you're very unlucky.