They want to keep him in town as long as possible. This is so they can put even more pressure on him to give up the dirt on the real crook JH so they can arrest him and bring him back to Bah. When that happens they will lock up JH for a period of time just long enough for "Pettyhard" to fall apart. Then they will ship JH back accross the water to serve time over there. Call it a double F.U. payback for what he has done.
Give MK a break. It must suck being stuck in Bah 24hrs 7 days a week with nothing to do but twiddle your thumbs.