The issue isn&#x27;t whether the invasive surveillance is acceptable or not.<p>The issue is that it <i>won&#x27;t work</i>.  If you introduce mandatory backdoors into any commercial messaging system, it will not be used; the Bad Guys(tm) will simply return to using open source crypto, like pgp-over-whatever that we&#x27;ve had for decades.<p>I.e. if strong crypto is outlawed, then only outlaws will have strong crypto.<p>The intelligence agencies know this.  Anyone pushing for backdoors in the name of counter-terrorism is either a fool or a liar.