Wrong decisions will always result negative outcomes.
Well, trying to be positive that some wrong decisions might turn to blessings but it's true that most of the time if we're deciding wrongly we will have bad results.
It’s not that you can easily regain all the money that you have carelessly spend, except if you invested in highly potential investments that are sure to guarantee you massive profits in the future just like what bitcoin can do for us.
If the loss is totally okay and you're going to recover from there, that's your own take on it. But any amount that comes from losses shouldn't be just thrown away freely even if you're capable of doing that. Unless, that's your attitude towards money.