I think you have missed the most important type, the Fed or Local cop that finds out his neighbor buddy is going to be raided on trumped up charges and makes a little phone call. One guy like that can counter a 100 man raiding force....and if it's just to arrange an escape there's not much risk to the guy making it more likely he'll do it.
The fact that we work amongst them and they live amongst us is a element that needs to be taken into account.
People that don't even like each other, will help each other if the hated feds come to town.