- Failing to register at SEC
A decentralized cryptocurrency should not have to register with any entity, least of all a local government body like SEC!
In your list you also forgot the most important reason: lack of utility.
Decentralisation is key to make a coin less prone to hacks and Bitcoin, for example, is decentralized. And Bitcoin has proven to be very reliable.
Decentralization does not guarantee reliability or success. After all centralized payment systems like PayPal are more reliable than centralized altcoins. And Bitcoin's high security and reliability is not because it is decentralized but instead it is because it has a solid protocol that works well in solving issues that would make such a system vulnerable.
Ripple is clearly a centralized project and SEC needs to take action against Ripple. Hopefully, SEC will win against Ripple because Ripple has committed lots of fraud already.
I don't think we should ever invite centralized entities to enter the cryptocurrency world (they aren't waiting for our invitation but that's a different discussion) to deal with shitcoins! Not to mention that because of the corruption in both the shitcoin team and SEC it is not going to change anything.
For example over the past months Ripple guys have paid a lot of money to the US president to be able to use him for their future scams...