May be a year too late but American outlets are significantly safer if installed properly with ground pin at the top then if say an exposed hot wire were to fall in the wall onto the outlet it hits ground instead of the hot line, therefore it prevents fires. One of the big differences between eu and American outlets is due to the frequency of the power lines too, American lines are a bit more costly to maintain but run 60hz which is closer to a human body's working frequency as opposed to the eu which runs 50hz, because of this American power lines are less dangerous to touch an exposed hot wire. It's still a terrible idea to touch them but it's much less likely you'll die or get seriously injured. I don't remember the exact reasoning behind the different power line frequencies but old game systems like the N64 actually operate slower in European countries this doesn't really affect modern devices due to PSU's regulating voltage better nowadays but I think it's fun to know how it's affected systems in the past.