I’ve know that Police do rush into burning buildings to save people…but never heard of a Medic/Fire rushing into a fight to make an arrest.

I’ve known that Medics/Fire do conduct Traffic control around bad accidents…but never heard of Firefighters who conduct murder investigations.

etc…

The lines do cross, but wholly different functions.

There is a reason why there are two separate departments…for so many hundreds of years.

As someone has already said…different skill sets.