I think 'these people are idiots' is an easy thing to think but almost always the wrong thing. Few people are idiots. Most people are just as smart as you are.
More likely, these people fundamentally aren't looking at the situation like you are. Probably, they don't care what you, or the police, or the FBI, or anyone else, think about what they're doing and don't care how they're being tracked.
They don't feel the need to hide.
It's comforting to think 'nah they must be idiots' for not hiding... but maybe more concerning to realise they could be right about not needing to hide.