If they need emergency help, let them die
Yup.
The violence against the police can at least be explained away and understood to some degree.
Going after EMTs and firefighters is beyond anything I could conceive of. I cannot fathom in the least why you would do that to someone who is only there to help and you might be the life they are saving.
Unfortunately, when they get a call, they do not know who the person or people are who need the assistance. But when they get there, if they are attacked, they should just pull out.