Flip flops are peak laziness and they have no tactical value.
I was the guest speaker for a Boys Christian Adventure group a couple years ago. The theme of my talk was that real men don’t wear flip flops, precisely for the reason you mention. Our job is to protect others and we cannot do that if our feet are not properly shod. (eph 6:15)
I told how I’ve stopped at car crashes and ran into burning buildings to help others. If I were wearing flip flops, all I could do would be to stand outside with my camera, along with all the other useless people.
We need to be constantly prepared to serve others (Gal 6:10)
Like Corey Comparatore, who laid down his life because he was prepared to protect his daughter and wife.