They can be dangerous weapons, correct! You are within your right to use your claws for self defense. If you were to murder or heavily mutilate someone with primarily your claws as the weapon, that is grounds for them being taken away from you. FINGERS AND TOES REVOKED!!! Of course, details and context matter for such an extreme outcome.

In sports, if you scratch someone, you are immediately disqualified, doesn't matter if it was an accident. Professional fighting doesn't allow claw use at all. Not only does it cause injury, there's just increased risk for disease! Nicki does a lot of streetfighting, just by looking at him, you can tell claws aren't off the table haha.