The problem is either they can't effectually enforce the law, or they won't.
Police have dispersed tons of protests on interstate highways over the past year. The next logical step might be employing some new microwave dispersal units, not opening fire into crowds of people.
It doesn't even mention lethal force. It just says they can do whatever's needed to fix the problem. Maybe that does involve non-lethal methods.
Or maybe it doesn't. The point is that we follow the letter of the law, not the spirit. If cops decide to mow down 50 protestors on a highway, they can point to this law and say, "Hey, we needed to clear the highway," and then nobody gets punished.
Better the state have the power and not need it than need it and not have it.
Didn't you just self-identify as far-right like ten minutes ago? Do you know what 'far-right' means in the context of American politics?