During a hostage crisis a few years ago, he acted recklessly, without concern for the lives of the hostages.

几年前的人质危机中，他肆意妄为， 根本不顾人质的性命。

I guess you got it.  A bull in a china shop is someone who acts recklessly when the situation calls for tact or care.

我想你已明白它的意思。" A bull in a china shop" 指在需要机智或小心翼翼的情况下依然做事鲁莽的人。