Perhaps. For me, there’s a critical difference. A Christian is not to take his own life by his own direct act; which the monks definitely did.
Mr. Park is carrying the Christian gospel to unbelievers - it’s in our job description; which most of us fail miserably.
Not really. Its a foolhardy suicidal mission with zero chance of any success. If his mission was to reach out to unbelievers there are plenty in South Korea.