This verse threatens those who reject the truth deliberately, and after it has been proved and made known to them: ``If in spite of all that proofs and clear signs, they still turn their back and reject the truth, Allah knows well the corruptors.''
It is obvious that, in spite of all that logical reasoning of Qurän, and their declining and escaping MOBÄHALAH, if they yield not to the truth, and obstinately continue their useless disputes, they don't seek the truth, They rather drive at corruption, and their aim is to ruin the faiths and truth, and of course God is not heedless to that.