I was referring to Estonia. I am not interested in his views on JFK, 9/11 or Pearl Harbour.
Bjorkmann is a qualified naval architect. That is different from 'having an opinion'.
As an example, there is a man with such severe dementia (cf Alzheimer's) that if you speak to him, he'll immediately forget no matter how many times you repeat it. Yet, put him in front of a piano and a music sheet, and he plays beautifully and perfectly, just as he did when he was a world-renowned pianist when he was younger.
This is because, the part of your brain that retains memory of learned skill such as walking, driving, making a cup of tea, etc - 'working memory' - is 'stored' in a separate part of your brain than other types of memory. (This is slightly simplified because there are some forms of dementia that affect gait and ability to walk or write.) Thus, someone can be desperately mentally ill and have awful political views, yet still retain their academically trained skills.
So your dismissing someone wholesale just because you differ from them in an opinion reflects on yourself not them.