Asking others and even yourself "why?" when it comes to views is a really good thing to practise, I agree. And don't leave it to just one layer. Ask "why?" after every single explanation and see how deep you or whoever you're asking can get. It's one thing to have a view and a whole another thing to know how you got to that view.

I've gotten out of harmful views by using this technique and realising that the only reason I held some views was because "others told me so", which caused me to look into things more.

Of course this won't work with really stubborn people but it's a good start to make at least some people think.