Leaderboard score

I'm pretty disappointed in these leaderboard. Especially in search and destroy. My favourite game mode is hardcore S&D. And every kill yields me 50 score towards my stats on the leaderboards, yet 1 kill in TDM gives you 100. Why isn't 1 kill is S&D 500score? I just don't get it. My stats look god awful compared to my friends who strictly play TDM. And add a damn map on hardcore when I press start! So many fucking team kills because you can't identity if it is an enemy or team mate!!