Truth alone triumphs - is truth in this case ?

Yudhishtra surprised to his cousin brothers in heaven, and asked narada about their sins committed on earth for which Narada says that the heaven is equal to all, the sinners or the pious ones. 'The happenings on earth are nothing but the illusion created by our creator' so, every thing is justified and nothing is justified. Yudhishtra never lied. But cos of the truth he revealed a life is lost. (i heard it in a discourse) yudhistra compelled to say the words and before he finishing full sentence, Lord krishna took his conch, pancha janya and blew it. The moment dhrona's last breath escaped, yudhishtra's chariot hit the ground with a thud.