You don't give a time frame on the alignment. If it was recent, then you may no longer have the tire wear issue. A PROPER alignment specifies applying a calibrating force pushing apart the front of the front tires. This simulates road friction's affect on toe angle at some arbitrary road speed. If this was not done, a worn idler will still cause tire wear - any pull and compensation may not be noticeable at the steering wheel, but it will at the left front tire.

If the idler bushings have never been replaced, they are worn out in that model. It was not a difficult job to do in ours, and the parts are cheap. You will at least need toe adjusted after.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7