The main reason that I suspect DropBox discourages encryption is that they rely a lot on deduplication to reduce their costs. If everyone encrypted their files, then even two identical files would have different representations server-side if owned by different users, so their costs would go up a lot.
That's as maybe but we have Healthcare that is FREE at the point of delivery.
That's not quite true for dental work, but the price is capped, so you'll typically pay £18.50 to see a dentist, £50.50 if you need something done, or £219 if you need something serious. It's only free if you qualify for extra assistance, which is automatic if you are under 18, under 19 (25 in Wales) and in full-time education, on income support or similar.
Russia or the separatists in Eastern Ukraine might have done this
That's a distinction without a difference.
although no-one is sure what they would stand to gain from it.
It looks like they thought it was a Ukraine military plane and were a bit too trigger happy, not realising it was a civilian aircraft until too late.
Ukraine's own military might have done it (they've done it before and denied it vehemently until it was proven beyond a shadow of a doubt).
Here's the thing: if the Ukraine were responsible, then Russia would have a vested interest in a visibly transparent investigation and be in a position to ensure that it happened. If they could convincingly portray the Ukraine as having shot down a civilian aircraft then that would significantly alter the political sympathies in the current conflict. Instead, they have done everything in their power to block it.
 Actually, given that this has happened on about 70% of my trips to the USA over the last couple of years, I can't really justify calling it unusual.