The pattern is if our Lord showed forth all longsuffering in Saul/Paul, saving the chief of sinners at the time...

then our Lord will continue to show forth all longsuffering toward any sinner who believes on Christ and His gospel.

No matter how vile and wicked, even more wicked than Saul of Tarsus, the chief of sinners at that time.

Such as some of the persecutors in North Korea, who torture and murder our brethren (elderly, parents, children) in some of the most horrid, vile, and disgusting manner, and also going after three generations to persecute one believer.

These persecutors too can be saved (like Paul), if they repent and believe the gospel of Christ, that Christ died for their sins, He was buried, and He rose again the third day for their justification.

Glory to our Lord Jesus Christ for His grace and mercy!