Why aren the big bang theory and the steady state theory considered scientific laws?
And we wouldn’t call the Steady State Theory a law, since it has been seriously discounted in recent decades. It is worth adding that when time honored theories become ‘laws’ it is not because they have be proven with 100% certainty. It is because they have survived the test of time and the test of many, many scientific challenges. Nothing can really be proven with 100% scientific certainty.