The answer is clearly written on the receipts given for donations. "Building bridges helps the nation and benefits society [helping others].
行善團善款收據單上清楚寫著：「… … 建橋能貢獻國家、福利社會（利他）… … 能解決一切冤孽、業障和解脫人生之苦難（自利）… …。」