3. Examples of occasions on which fixed Japanese expressions are required have been mentioned. Then,
それを覚えるのが、大事な社会教育だと言ってもよいだ ろう。
I roughly understand this to mean "remembering these (expressions) is important to one's social education", but how would you translate と言ってもよいだろう? There's just a bit too much going on there for me to decipher. I suppose it's expressing the writer's opinion about the probable degree of importance of remembering these expressions, is it?