但說無妨

there is no harm in saying what one thinks (idiom)

but / yet / however / only / merely / still

to persuade

to speak / to say / to explain / to scold / to tell off / a theory (typically the last character in a compound, as in 日心說|日心说 heliocentric theory)

to speak; to talk; to say / to explain; to comment / to scold; to tell off / (bound form) theory; doctrine

not to have / no / none / not / to lack / un- / -less

no harm (in doing it) / One might as well. / It won't hurt. / no matter / it's no bother

to hinder / (in the negative or interrogative) (no) harm / (what) harm