They make me uncomfortable as well. Any major theme park will have huge crowds waiting to enter at certain time of the year. Any sporting event will also have huge crowds.
Last week my son had an "incident" at his school. I was notified of it immediately. Turned out to be nothing. When I got home from work I asked him about his day as always and he said that they had a "drill at school today". I asked detailed questions about the drill (was my first experience with this and didn't know exactly what they did.) After he told me about it this is what I realized- They Still Are Not Safe. And I don't think there can be any process, door locks, etc implemented to make them safe.
I think this applies to theme park/sporting events as well. No one knows how to handle our crazy world right now, so they are trying to implement things to make us "more safe", these things do help, but it is not possible to completely eliminate anything from happening.
Not trying to be morbid, because I think the chance of a terror attack at a theme park/ sporting event or school shooting is less of a probability than a car accident.
And yes, that is outside of the park, which is why you can see the fountains etc inside.