Lifnei Iver - Weapons Sales (Mitzvah 232)
"לא תקלל חרש ולפני עור לא תתן מכשול ויראת מאלקיך אני ה"
To what extent is one who sells weapons liable for any illegal or immoral use? Even if selling arms is a necessary evil, we need to be careful not to treat it as a lechatchila. We need to remember it's not the ideal situation.
Does the prohibition of lifnei iver apply to gentiles?
Giving somebody bad advice.
Rashi prohibits involvement in building a place that is used for killing (e.g. for gladiator fights) because of lifnei iver.
Delivered at the OU Israel Center, March 20th, 2019 (Taanit Esther 5779)