I keep saying that, but you know what else is an "obstacle to investigations"? Door locks. And window blinds. And envelopes that don't let you read the letters inside. And clothes - you can hide a bomb under them!
We should definitely all get ankle bracelets that will constantly transmit our location and record audio/video of everything we do so that we're not an obstacle to any investigations... How else would benevolent agencies like Europol keep us (AND OUR CHILDREN!!!) safe?