ratiocinator
Lightly seared on the reality grill.
Sound argument: the premises are likely to be true.
No, a sound argument is when the premises are true.
So by your logic, given that there are possible alternatives for say "the theory of evolution " we can invalidate such theory ?
Nobody is trying to support evolution using a categorical syllogism, it's a scientific theory based on empirical evidence.
My point is that providing alternatives is not enough you most show that the alternatives are better. (Agree yes or no?)
Alternatives to the premises show that a deductive argument is unsound, i.e. the conclusion is not proved.
So the KCA concludes that the universe has a cause, do you have a better alternative? Care to share that alternative?
Yes: we don't know. There is not enough evidence to say whether there is a cause or not, it's also a rather vague and ill-defined idea when you consider that time, hence causality, are a part of the universe. It doesn't seem to make sense as stated, you'd have to postulate some larger context in which causality was still relevant, but then you're off into an infinite regress anyway. Can you have a cause for causality?