何必当初 meaning in Chinese

Why act in this way at that time?

Hah , before we slap niggaz silly with somethin
早知结果如此何必当初曾相逢
And listen to all the i - told - you - sos ? no
然后成天听他们唠叨“早知今日何必当初” ？不干！
If so , then , we may ask , why should they , in the first place , exasperate the individuality of the single school , and then dispense from it
万一政府肯豁免的话，我们会问：那末何必当初？先用法例把学校的个别性强化了，又用豁免将它取消？
If you were to die this evening with no opportunity to communicate with anyone , what would you most regret not having told someone ? why haven ' t you told them yet
要是你今晚就死翘翘，没有机会与任何人联系，你最后悔没告诉某些人的是虾米？早知今日何必当初，当初为虾米不告诉他们涅？