7 month old watch zombie game

Now I know for sure husband plays 3D zombie games with son watching screen while I'm away at work.. Once I came home sooner than expected and my son looked spooked sitting through the goriness :( I feel like such a bad mom and now I'm wondering if dad being home with baby at 7 months old is a good idea.. Please experienced moms fill me in am I over reacting or what? 

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