Please don't assume playstyles of a large population of players. You're confusing "Need" with "Want". You don't "Need" to shoot the lights...but some certainly "Want" to shoot them. Almost everyone I have seen playing SCC automatically starts Luminocide. It becomes a natural thing to do. Many people play like that. In fact in several coop requests you'll see a specific mention "I don't/do like shooting lights"....a separate criteria. So yeah...it became a necessity to provide enough ammo to both fight, flee and hide.
Not perfect..but make do.. Hopefully SC6 rectifies it *Cough-optional-Cough*