I think it may be more accurate to say that complex problems don't have "simplistic" solutions as sometimes there can be relatively simple solutions and I would

I think it may be more accurate to say that complex problems don't have "simplistic" solutions as sometimes there can be relatively simple solutions and I would not rule out the possibility for a problem like bullying. For example, depression is a problem with a complex origin but cognitive therapy is a relatively brief and simple solution that has been shown to be effective in many cases. Simplistic solutions, e.g. "think positive", however, do not work.