YOU SAID:
why must you be so frivolous, young man
INTO JAPANESE
なぜそんなに軽率にならなければならないの、若者
BACK INTO ENGLISH
Why do you have to be so imprudent, young man?
INTO JAPANESE
なぜそんなに軽率にしないといけないんだ?
BACK INTO ENGLISH
Why should I be so imprudent?
INTO JAPANESE
どうしてそんなに軽率なの?
BACK INTO ENGLISH
Why are you so imprudent?
INTO JAPANESE
どうしてそんなに軽率なの?
BACK INTO ENGLISH
Why are you so imprudent?
That didn't even make that much sense in English.