Oh boy, does this really need explaining? You are taking the piss, aren't you?
When you say "its in their blood" it's a racial reference, and also refers to Nazi ideology. "Germans" isn't even a race.
When you say "Germans are a warlike people" it's a reference to nationality. The nation has not existed for so long, btw, presumably you are referring to the people who have inhabited the geographical area.
Really, you are taking selective historic information, most of it is alluded to rather than spelled out, btw, to assertain a characteristic of a people.
That's equally false as saying Germans are a philosophical people, though many notable philosophers come from Germany.
I am German, btw, they don't come any more "Germanic" than me, "unadulterated" lineage traced back to the 17th century.
I have neither a warlike attitude, nor am I particularly bright or versed in philosophy, although I do kick arse sometimes - verbally. lol
If you are of German descend, I understand that you may be searching for your "roots" and hold an image of your ancestry - but in this case, it's a stereotype, a fantasy, it's not real - sorry.