I think tools are some of the most profitable players to play against so we should let them stay

In reality, its up to each site to decide its own policy, for example Cake Poker dont allow HUDs, realtime hand history imports into software, AHK scripts, and so on.
If you dont like that people can use these things against you then move to a site which specifically disallows them and vote with your feet, cake has a large enough playerbase that cash and tourney players would be able to play whatever they want there. ( if you're pro then maybe not ).