It is easy to say such things about any new logo once it is done.
It is a bit like saying modern art could easily be re-created... people dump a load of rubbish around a bed and say "look I can do tracey emin".
If a kid's crayon drawing is the most appropriate logo for the conservatives (and I'm not saying it looks like one) then someone had to spend time with the party on assessing what they wanted to portray, probably drawing up several alternatives, advising on colours etc.
40k seems like quite a lot for simply coming up with the logo, I'm sure if I contacted some design companies I know they would do it for less, but you don't get that kind of consultancy for a fiver.
It is like getting a dentist to look at your teeth and he says they're ok, then your 8 year old kid says "you've got nice teeth" and you say - why did I go to the dentist, my daughter can do that! You are judging the result and not the process.