why I believe that nobody will help them

Altough I do wish that they succeed with their figth for democracy, I do not believe that any foreign power will come to help them simply because Hong-Kong doesn't have anything to offer to compare with the backlash from a possible war with China, so sadly they are completly on their own, I even think their best chance of succes is asking Putin for help and not Trump. Though I do hope they will succeed but I really doubt it.