Only fools say boitcoin is a scam because now there are countries that have legalized bitcoin in their country and many people have invested in bitcoin for the future because they believe bitcoin can be used as an asset for the future, so now it has been proven that bitcoin is not a scam.
Unlike it, because we live can not be separated from the pros and cons.
And they could say that, it does not mean they are stupid but they are sure of effort or indeed the activities they live and they do not like Bitcoin because they can disturb the electability of the business they run.
This is a wild argument for us when saying Bitcoin scam but we cannot forbid them (who don't like Bitcoin) say this because everyone is free to suggest their arguments.