Well, I always believed that to hate Hitler and all that he represents should also mean to stop any Hitlers from gaining power in other places in Europe. Isn't that reasonable? Just sitting aside doing nothing is a form of complicity, isn't it? After all, Hitler rose to power and caused the death of millions only because too many decent people did nothing.
And please stop with Greece, it is silly. Greece has major problems with Turkey (including daily air space violations), Greece is still trying to get out of the 2010 bankruptcy, Greece is too small to help Ukraine in any meaningful way. It is really absurd for Germans today to point to Greece, and expect Greece to lead them! As you say, it is Germany who builds submarines, not Greece. Germany should be offering its submarines to Ukraine, because Germany does not face any dangers today.
https://www.keeptalkinggreece.com/2022/04/27/turkey-record-violations-greece-airspace/"
"Turkish F-16 fighter jets recorded on Wednesday a record of 126 violations of Greek air space and 30 overflights of Greek islands some of them inhabited."