To be fair, from the 2 replays we've seen, it looked like everyone else had slowed down (possibly due to the Porsche spinning into the barriers), it caught the #8 Toyota out (looked he spun when catching them unexpectedly), then Bird, behind him, just plowed into the #3. The first replay alone looked 100% Bird's fault, but the 2nd replay shows the Toyota also running at pace, and the Porsche seemingly causing the issue in the first place.
If Bird had tucked in behind the Toyota, he had no chance of avoiding it.