But an acceptable and very probable polemic born at moment of rescue of the latest 114 survivors from about BISMARCK's 2300 crews by the British ships.
It was said the battleship alive crews hoped a best treatment of prisoners not saying they sank their ship themselves to don't upset British that minimising their victory . This is a reasonable possibility.
But the major point I kept in mind from long date like it is said in the serious Ludovic Kennedy's book Sink the BISMARCK is there was about 400 crews still survivors swimming at sea when the highest German still alive officer which was captain lieutnant ranked was the last in position to give order to abandon the ship at that point totally upperworks destroyed by RN gunfire . But, despite of no hope for the ship this officer did to save these lifes ordering to open hull bottom flood valves to sink the ship in state of wreck as fast as possible but so solid that it didn't sink .
Easy to admit it shouldn't be acceptable for Germans of the time to see the BISMARCK hull towed and exhibited like trophee in a British harbor .
So , to save the lastest 114 lifes effectively boarded and avoid unuseful sacrifice it was the best to short cut Brit torpedo shoots and gunfire in scuttling the battleship by oneself , his own crews.
So, both RN and Germans contributed to sink the battleship , one , the RN condemning it definitively and the other , the Germans sinking it effectively .