He collects every poison, venom, and drug so he can make antidotes, especially ones easily produced on a mass scale. He studies them so he can learn where they come from, how they would be used against people, and how he can cure them.

[The rather sour expression doesn't exactly ease with the consolation. He hasn't said or confirmed as much, but Batman is his father, and he's just naturally defensive of people trying to shit on his work.] Batman isn't someone you would ever have to worry about.

He's not like whatever greedy, moronic men you know.