Or you can design a system (like any number of crypto systems) that aren't vulnerable to these sorts of attacks. A compromised CDN could cause this problem, whi

Or you can design a system (like any number of crypto systems) that aren't vulnerable to these sorts of attacks. A compromised CDN could cause this problem, which now means that Mozilla would be liable for things that they don't administer. And resolving technical problems through the legal system never works well. If you can design something so users don't have to constantly trust you, then that's a much better solution. Not to mention that Send likely doesn't have a warranty (like most software under a free software license).