two-edged

“We have a two-edged sword,” he said.

"Like everything, tech has a dark side. It is a two-edged sword," says veteran Silicon Valley watcher, Prof Mike Malone.

While the monarchy is a symbol of Britain’s history, that can be a two-edged sword.

OK, that can be admirable but it’s a dangerous two-edged sword.

"It's absolutely true that the closer political power is to the people, the more responsive political power tends to be. But that can be a two-edged sword. Local governments are at least as capable as the feds of passing laws and ordinances that violate the presumption of liberty in the Constitution… Tyranny isn't OK just because it is approved by a majority of your fellow townsfolk."