Why Hawaii's volcano is so UNUSUAL

I am going to ask an odd question. Why can you not keep the pressure underground of magma to a constant by piping into it to bring it to the surface before it gets under so much pressure that the volcano explodes and becomes dangerous. Something on the lines of extracting oil. Say using heated pipe at the start so the lava does not solidify in the pipe on the way to the surface. If and a big if you could do this you could redirect the lava extracted away from homes and maybe create more land. I am presuming that the magma is under constant pressure underground so would travel up to the surface along a heated pipe.