Two wrongs don't make a right, but we are assuming a lot, (like the SUV merged into the bikers lane). It could have been innocent as he didn't signal his intent and the biker over reacted. We could come up with 1,000 scenarios doesn't make it proper for the biker to be yelling and cursing while in stopped traffic. As Rob said he could have got off the bike and accomplished the same result at the driver's window.
For those who said he "could have killed the biker" with the merge, (IF that was what actually happened), maybe if they were doing proper speeds, but really in stop and go traffic I doubt he would have, (and if the rider couldn't avoid a slow speed collision then should they really be riding)?
Just another example of why we ride like everyone is intent upon killing us then we avoid these situations. In reality if the SUV driver did merge unintentionally a blast of the horn and a WTF gesture likely would have sufficed.