Earlier quoted context omitted.
WW2 (at least in europe) was pretty much a result of the harsh on the loosers of WW1 treaty of Versailles. So germany did not feel much love from the world - the world was demanding lots of pay as reparations every year(I think it was originally planned till 1990!). They felt they have to get strong to reclaim what was theirs. (Very simply put)
No matter how much 'love' you give, someone somewhere will want to take more from you. And if you have nothing to defend yourself with they're going to walk all over you. What 'love' do you think the US should have given to Japan to stop them attacking? What do you do when you've given all your 'love' and have nothing left and they ask for more or they'll attack? You need a military and it needs to be good.
But the thing is: for example switzerland can claim they are honestly doing this. The US not really. There it seems more "to prepare for war to go for war".