We cannot materialize a containment method out of thin air. In the first place, this entire situation is because the current method of containing it failed. We have no method of containing it, and if we let it go free, more people will be killed by it and this situation will only happen again to others. I understand your reasoning, but it is a matter of practicality... Unless you intend to tell all of the people that died that their deaths were acceptable because it was a child that killed them deaths, the most we can do is try to find another way.

To be honest, I do not see any other way, myself.