Re: governments can always legislate
"A much better idea might be to go back to your elected overlords and suggest they think more carefully about what should - and should not - be "illegal"."
Not "should", but "can" be made illegal. Legislators (lawyers that couldn't make it in private practice) may never wake up to the fact that banning math or software won't do any good. A company in some country that isn't a signatory to the ban is going to sell encryption software online without caring in the least. A country like Russia could ban in in their own country yet make it available everywhere else just to piss other governments off when they feel like it.
Biting the hand that feeds IT
