There is nothing bad in learning from mistakes if encountered, but it is a wise and smart move to learn from others' mistakes so that you do not learn life the hard way. Doing that would help save time and the stress of starting all over again. One thing we should know is that mistakes are time wasted, although one has learnt from their mistakes if encountered, but the truth is that the time spent on that event that resulted to such an inicidence is already wasted so in that case, a wise man would learn from ones experience so that they do not encounter such and if they do, they already know how to remmedy the situation to save them time and stress.