It's the Daily Mail and the internet. Its full of this shit. Only read the Daily Mail if you want to get angry. Its the golden rule 
I have a theory that general discourse tends to reflect who is in government, so if the Tories are in government people feel more able to express the views they advocate. So we get more of this shit. I don't think it means there are necessarily more people saying this stuff, just it becomes more vocal.
And re evidence-based policy making, it may be that Labour also picked and chose, but they do have a broader spectrum of life experiences to pick from than the Tories. They are exposed to a wider range of influences than the Tories also. So of course they weren't perfect but they are not the same.