Fruits and vegetables are prohibited from entering almost all countries and any idiots would know that. Pretending "I didn't know about that" would be to feign ignorance. It should be grounds for denying entry for life.
any blatant violations of bringing food into the country should be immediately followed by a heavy fine and 3, 5, to 10 year ban from entering the country again depending on severity of the case. This would solve many problems....but do countries enforce punishments strictly? nope......
how these violators manage to pass their own countries customs BEFORE entering Japan is unbelievable. The initial baggage scan from airline checkin should have already caught all these!