Marines and garp

[Kaname]

Why would Marines allow garp, in their ranks?
His son and grandson are wanted pirates and still they allow him to be with them. I don't get it man

 

[Star_Of_Hope]

Still he had done his best to capture them so far. 
He even tried to go through with the plan of executing Ace, even though he cares for him a lot

 

[Demon_skeith]

Most likely he held rank/fame before either of them became troublesome. As well as prove his loyalty.

 

[Kaname]

Most likely he held rank/fame before either of them became troublesome. As well as prove his loyalty.

He got a heart man.
If someone asks him execute or murder Luffy in cold blood, he wouldn't be able to do it