The United States would use a few thousand of these and clone all the Special Forces, Seal Teams, Rangers, and Marine Force Recons, and have the best military that doesn't die.
Or they could transport people into suicide missions but they can do it again and again.
If the terrorists get ahold of the technology, they'd use it to to send suicide bombers everywhere.
The two main drivers of technology are the war and porn industries. If it wasn't for the porn industry we wouldn't be able to watch netflix on the XBox. If it wasn't for the war industry, we wouldn't have the internet. If it wasn't for the porn industry, internet payment systems would have been delayed by several years.
I can't thing of any HORRIBLE tek pioneered by the porn industry. While there is a lot of examples from the war industry.
Maybe the right thing to do is to preempt the war industry and give the keys for transporter tek over to the porn industry.
I'm not all that worried about the terrorists. I'm more worried about the government. I have a feeling if we just walked away from the middle east... just that simple. walk away. Things would sort themselves out just fine.