Their book is the Bible…same as you find in every Christian church on the planet (with some minor variations in versions).
If you do not think different people interpret the Bible differently you are not paying attention.
Hell, people disagree vehemently on how to interpret the 2nd Amendment and that is one sentence.
I doubt you’ll find another Christian group in the US, no matter how rabidly religious, who would agree with WBC that they should go protest the deaths of seven children in a fire. WBC is nuts even to other nutters.
WBC is difficult to deal with, given that if you argue with them, they invoke Rule 14 and automatically win the argument. But I do thave knowledge of a method that can scare them off.
Step 1: Puff up your chest and flail your arms in a threatening manner, so as to make yourself appear larger. It is also advisable to make direct eye contact with the leader, which indicates that they are in your territory and must leave.
Step 2: Yell and roar at them, so that they think you are a predator. Is it very important that you DO NOT physically make contact with any parts of their bodies, as they can then sue for assault.
Step 3: If you have followed steps 1 and 2, then the WBC should bugger off, and not return for several months, because you have asserted that the area they were picketing is your territory.
Congratulations, you have successfully fended off the Westboro Baptist Church!