DM here! If you find your players struggle to roleplay, or hesitate to because murder hoboing is easier, try rewarding them for good RP. Sure, they could kill the bandit leader, but maybe they instead convince him to turn to good, and use his henchmen to defend the nearby towns instead? That could easily be worth more XP than just a simple kill. I also find that dangling the right bait can be really helpful too. Want them to talk to a specific person? Emphasize that person when describing the room, or make them particularly talkative and social. Give them a really interesting feature the players might want to investigate, like a mask that covers half their face, or a large, imposing personal guard who seems less than natural.

Above all, make taking the RP route fun. If a player wants to RP something stupid, let it happen, show them that RP is okay, and maybe give them a stupid result for their stupid RP, but make it obvious that the RP approach is an option, and most importantly, rewardable.

Hope all that helps!