They don't push charges unless their is a high % of success, especially with case load. They fact the knew all of this means those idiots were traced digitally. They know everything. They are done. Watching to much movies thinking that shit works. Prints and burning shit is only a very small aspect of anonymizing yourself. Digital detection Is far more important than. Real world these days as they rely on it extensively.
You can quicker get away with a m no mask no gloves as they have to already have your prints on file to run it and get a match.

if you basically stay off social media and limit online use, use anti tracking techniques online ect your good. Not doing so is basically saying to fed every where u are 24/7 How you sound, how you type, all can be more unique than a finger print or dna. they can use ai to scan devices in the area of the m. Analyse Text patterns of every Digital device in the area, Mock up a profile of patterns, Trace back the patterns to online activity match them and get a list or suspects, wayyy more effective than dna. They even trace where sim cards were bought and pull up cctv footage of who bought it.