I understand the need to take anonymous tips seriously, but I mean come on... an email? I hope there was more than that.
If I assume the counterfactual where someone's attempt to tip police was ignored and an incident results, the public will criticize the police undoubtedly. Still, at some point there needs to be a minimum for verifiable, trustworthy communication if such a tip results in swatting. If I effortlessly generate dozens of plausibly-sounding scenarios, tip off the police in intervals spaced far enough and automate it, when would the police start categorizing anonymous emails as noise?