anyone who didn't know it before should have learned that bad things can happen RT

anyone who didn't know it before should have learned that bad things can happen RT
anyone who didn't know it before should have learned that bad things can happen
RT

anyone who didn't know it before should have learned that bad things can happen RT
坏事发生了才知道它会发生.
或者
任何人在事前都不知道会发生坏的结果

以前不知道的人现在应该知道了，坏事是会发生的。