Basically I have no idea where you get the image that Chinese admire Hitler so much, maybe some Chinese do but I am sure not a huge amount. Even Mao is heavily critized in modern China by young people nowadays.
I did not learn any Germany before but I am interested in Germany culture as well. German is always considered a country that have already sincerely regreted to the Wars compared with Japan, but it is only the image that Chinese Communist Party wants to show, in order to enhence its anti-Japanese policy.
I personally have interest on both country and am learning Japanese by myself, and I think Chinese learn Germany language not because of Hitler but just for there curiousness.
[This was actually first meant to be a question, not a notebook entry, but there are a 1000 characters limit there, and I failed to fit my thoughts even into 2500 characters limit here. I didn’t want to remove too many sentences, so the text would remain more or less coherent. So I mean to finish here.]
I don't mean to criticize Chinese people with this suggestion. After all, admiration of Hitler is not uncommon in many countries. And who am I to prescribe other people what they should find interesting or admirable anyway? But I am very interested if there is a connection between this tendency and the popularity of the German language in China. Even if it is the case, people are very reluctant to admit it.
I am welcoming Chinese people to comment on why do you think German is so popular in China, why do you personally want to learn German, because chances are you do, and if my suggestion is indeed correct and you don’t want to let it out publicly, to write me a personal message.
I thank everyone who managed to read the whole article!