It's quite simple to stop people from getting your hood open this way.
Just pull your latch off...just two bolts(try and mark where it's positioned for alignment purposes) and get a plate of either aluminum or stainless at least 1/8" thick, or thinner if you can secure the bottom(weld/JB Weld).
I did this many years ago, a bud of mine took it a bit further and added some razor blades and a warning sign on them(that the bastard thief wouldn't see)
But recently, this mod was made pretty much useless by my oil cooler, there's no room to get your arm up there any more.
Also, someone pretty much said "so what if they pop your hood, everything is bolted". I know of some people that will have an intake off in under 15 minutes and have the guts to do it in an apartment complex with the owner in their apartment just a few feet away!
Alarms are OK, but my bud had some "buddies" of his show him just how good it was. They had his car running in about 30 seconds with the alarm going off down the road.
And just FYI, most stang thieves carry an extra coil wire, jumper wires, cap/rotor, fuel pump relay(under the seat) as well as a full tool set usually.
I have 4 different kill switches(fuel, CPU, spark, starter) 3 of which not even my family knows about and I could hand you the keys with no fear of you getting it started. But as stated above, they could just tow it, I am currently looking for wheel boots to help prevent this as well.
I've read an article where a guy's stang was stolen so many times he literally had to chain it to his homes foundation! Thieves are rat-bastards!!!