[habinero]

I've seen several professional geologists answer this question, and no, really, volcanos don't work that way.

For one, the scale is way, way too big. It's like stabbing an elephant with a needle and expecting it to bleed out.

Also, the dangerous type of magma is extremely viscous and gas-rich. It doesn't flow like Hawaiian lava does.

[Someone]

But in this case, we want the elephant to (significantly) bleed out, so won’t we need a BIG needle?

If you want to move lots of heat away fast, you either need a big pipe or a very high flow rate.

“Gas-rich”, to me, also sounds as if it would be more dangerous.

[habinero]

In this analogy, the needle is as big as we can make it.

Gas-rich is where the danger is, as I understand it. Those gasses expand as they get closer to the surface, and if they're trapped in viscous magma that doesn't flow easily and puts a lot of stress on the rocks above.

The fluid basaltic lavas of Hawaii don't explode, they flow out and make shield volcanos.

Check out geologist Shawn Wilsey's videos.