IMA if this is truly a simulator then anything goes. Chute shooting was reported on both sides of the channel, though more often by the Germans. The tactical reasons for this was that when a German pilot bailed out he was captured and out of the war. When a RAF pilot bailed he could be back in the air within a couple of hours. The Luftwaffe actually complained that rescue sea planes with red crosses clearly painted were shot down by the British. The British excuse was they were reconnaissance aircraft.
No doubt most of us don't vulch, chute kill or attack AC's that have just taken off. For those that do, all's fair in love and war. Personally I like killing vulchers so bring it on.