Well I can't disagree with that logic, but if you are innocent and have nothing to hide, then go ahead and look at the phone.
I guess I must be boring, I've never wanted or needed to joke about killing someone, in the government or not. It should be difficult to bring any additional charges against someone if they were looking for evidence relating to A and find evidence relating to B. But that may very well not be the case. Lots of different government agencies out there with different rules and regulations. I would think a good lawyer should be able to get someone out of that though. But again, if you have nothing to hide then you have nothing to hide.
Jesus, lets stay on topic here. Its not that slippery of a slope.
What are you talking about? What if aliens come down from the sky tomorrow and take over the planet? What if Jesus (who doesn't exist) comes down and takes his "children" next Tuesday? We can "What if..." forever. It is not illegal to belong to any religion, it is not illegal to be a member of any political party and it is not illegal to be a descent and of a particular ethnicity. Until any of those are illegal, there is nothing to worry about. If any of that ever were to occur then we would face much larger challenges than what is being discussed here today. Much larger, and more important, challenges.
At least in the US you can be innocent and still have to prove it.