I don't really think the situation with a Canadian fan and a Slovakian fan (or any fan of non Canadian nationality) are comparable. Canada has more elite players historically than all of the other nations combined. Canada's hockey history is not compromised at all by Lidstrom passing Bourque to become the consensus #4 defencemen of all time, considering Canadians dominate the position historically and have the remaining spots above Lidstrom. This is true even if you rank Lidstrom #2 all time, which would not be a huge stretch. If the argument was Lidstrom over Orr then I can see Canadian fans actually having an agenda as the argument would be over who was the greatest defenceman ever of all time.
Sure Canadian fans are going to be biased as all fans are, but I believe that other biases (team played for, era they played in etc.) are probably stronger in the Lidstrom-Bourque discussion. It is not as if Bourque is particularly revered in Canada for a player of his ability either.
I am Canadian and I have brought up the bias factor at times against Lidstrom. I admit I may be wrong about that but to me it looks like it's apparent when some people list the all-time defenseman. I have a hard time accepting Shore so high on that list because he played so long ago and only against fellow Canadians. I think we need to accept that todays game is a lot more competitive due to so many other countries producing great players, too.
This is off topic but how many people even played hockey back in Shore's days compared to now? I don't think it's even comparable and dominating the way Lidstrom has for so long is a much bigger feat than what Shore accomplished IMO. It's not meant to disrespect Shore because he was obviously a great athlete - that's just the way I see it.
The other bias people mention against Lidstrom has nothing to do with nationality and that's his playing style. To me he's basically the Gretzky of defenseman. He thinks on a higher level than other players and rarely gets hit, yet doesn't play physical or have jaw dropping physical attributes. It was obviously hard for people who didn't watch him every game to see this at first and many labelled him a soft offensive dman when it was cleary not true.
I don't see why placing Lidstrom #2 all-time is a huge stretch at all. He's got the indvidual and team accomplishments, the longevity and many intangibles that others don't have such as not taking penalties and avoiding injury which makes his career value worth even more.