It wasn't just BSA that built weapons. Probably all bike and car manufacturers that were around during times of conflict would have played key roles in warfare by producing equipment to support their country's war effort. But if we were to hold a grudge against them for that, the world vehicle industry would come to a grinding halt.
Why would anyone hold a grudge in the first place ?
BSA , during WW2 , produced more armaments than the rest of the UK put together ....... it`s workforce putting in long hours to ensure the country had the weapons it needed to ensure it`s survival , often at dispersal locations dotted around the country , after the main factories were damaged in air raids during the blitz ........ these includied the Browning machine guns which were the main armament of the Hurricane and Spitfire fighter aircraft during the Battle of Britain ......... so no grudges held against them for that ............
It`s worth noting that at the same time the BSA workforce were working on a voluntary basis , BMW were employing slave labour sourced from the Nazi concentration camps .......... a fact they finally got around to apologising for back in 2016 , during their 100 birthday celebrations .......
So yes , as you rightly say , in some cases it may pay not to look too closely at those who produce the vehicles we " know and love " today .......

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As an amusing aside .......... During WW2 BSA were busy manufacturing the Boys Gun ...... ( an anti-tank weapon ) .........
A question was raised in the House of Commons by an MP ... ( Mental Pygmy ? ) ...... demanding to know what the hell BSA thought they were doing producing " boys guns " when there was a war on .........
Some things never change .............