To join one despot's army to fight another despot's is a mistaken notion at best, a notion of agreement with that despot's ideology at worst. Stalin may have been worse for Latvia then Hitler at the time, but Latvians had the option of remaining neutral when Hitler's army conquered Latvia. By joining Hitler's war, they aligned themselves with his policies. Especially those who joined the Waffen SS, instead of simply Wermacht. Wermacht's official mission was to fight the Russians. Waffen SS - was the clean-up squad that followed close behind and massacred jews, communists and any potential opposition. There is a BIG difference between fighting Stalin (for example, like the Fins did) and joining up with Hitler - like the Latvians.
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from the article: Nazi veterans in Latvia march to remember fallen comrades