If you want to re-spray your car after removing the tar spatters, go ahead and use some buffing wheel. But remember - the tar spatter is so thick that buffing not only removes the tar, but also most of the paint next to the tar spot.
If you want to remove the tar only, you need to remove it with a solvent that works on the tar only, and not on the paint. Any aliphatic hydrocarbon will do the trick, such as what in South Africa is called benzine and shellite in Australia (check the spelling carefully and don't use benzene, nor petrol / gasoline / diesel), or kerosene, solvent naphtha, mineral turpentine, white spirits, mineral spirits, stoddard solvent; different countries use different names for what chemists class under CNH2N+2, with N somewhere between 6 and 12 and boiling points from 60-180 oC.