Saying "I could kill you" isn't a bad thing.

[asdvek]

"I will kill you." is a threat therefore illegal

"I COULD kill you" is not a threatttttttttt therefore not illegal
it just says what the person saying it is capable of

so i could kill all of you

 

[beefliverontop]

I will kill you,
Yes. I will kill you. This is not a threat. Im serious.

 

[shia.jihadist]

i will kill all niggers

 

[Darkeningstar]

I might kill you