It's quite strange that people keep claiming Ali "dodged" the draft (he didn't) and that that was inherently wrong.
First, Ali didn't dodge the draft. He didn't burn his draft card or run to Canada. He was willing to face the consequences.
Second, there is nothing inherently wrong with refusing to serve. If this were not the case, then every instance of refusing to serve would be wrong. This would include a German citizen refusing to serve his country during WWII. But that wouldn't be wrong. It follows then that refusing to serve your country is not inherently wrong.
You might argue that refusing to serve was wrong, not because refusing to serve is inherently wrong, but rather because the goals of the USA in the Vietnam War and the means they were employing to achieve those goals were justified. I and many others, including Secretary of Defense Robert McNamara would argue that the war was a mistake.