Why is everyone seemingly allergic to playing a tank top or jungle?

Seriously, the times I lose top or jg in Blind Pick the top is mostly Riven or Yasuo , and the jungler is almost always Lee Sin. It's disheartening as a tank main to see so little value placed in picking a tank. I may be Bronze, but these are plats and Diamonds in Normals picking full squishy damage comps with no regard for a proper durable front line. Is it just my elo, or is this something that's happening more than it should? EDIT: For those of you downvoting, instead of blindly doing that, why don't you tell me why you are downvoting?
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