The grounds to arrest me are me not obeying a direct order, not asking "why".

Police officers have the authority to make quick judgement calls in many situations. Obviously we are all human and I could ask why and try to plead my case, but I should also expect that after some time of non-compliancy I may be detained. The felony is called something like "failure to obey a police officer".

And it's in the laws of the nation.