In a society where many people have learned it's ok to "blame" others, I see this clearly, I think. In the particular case, as others where the parents are being blamed, I suppose it's because they believe the guy must have been raised that way, with no respect of animals?

It's unfortunate at best. That they talk of him as a "marine" without allowing for what he may have been through militarily for this country is disheartening. He probably was suffering mental unwellness, don't you think?