"I wish people would stop blaming the previous government" vs. "Thatcher ruined this country"

I'm sure we're used to hearing the standard Conservative defence of current economic mess - shifting blame to Labour.

And then we regularly hear/see the "I wish you would stop blaming Labour" reaction, from normal people or even politicians.

But on the other hand it seems Labour/the left are still blaming Thatcher for some things; ruining industry in "the North"; decimating coal etc. and that was decades ago.

Is there some hypocrisy here, or am I stretching things?