Because Austria's army in 1788 was not one single and unified fighting force. Rather, Austria's army (Which at the time was not called Austria but the Habsburg Empire) was composed of squads from many smaller nations that were found in the Habsburg Empire. Because there were strong nationalist tendencies among these, they spoke differently and this eventually lead to big differences among different groups and attacks between each other.
Explanation: No, this shouldn't be a law because if a theif overcomes you in a fight because you cant use a weapon then he could kill you. The theif is also a criminal not worthy of this life if he wants to steal, so killing him wouldnt be as big of a problem. If the theif runs away with items then using a weapon could stop him.
Igneous rocks are formed directly from lava cooling quickly at earth’s surface