They seem quite different to me. Hitler didn't drink Farage does. Hitler was vegetarian(ish). Farage isn't. Hitler didn't like foreigners. Farage is married to one.
I thought that did that when they appointed that chinless Tim Farron, but I have to say I was taken aback when I read the whole non-MP thing. Maybe they want to appoint Charles Kennedy's ghost. At least people noticed them when he was the leader
The other thing is that it's a fairly massive insult to their sitting MPs (and the people who voted for them) that they don't think any of them is good enough to lead the party