It's push vs. pull. Ads pull you by creating a want (either lust-driven or fear-driven) and conveniently pointing to something that can fulfill it. The followers of oppressive and hateful ideologies instead push you to do something or adopt some belief, under threat of being labeled the enemy should you not comply.

Put another way, the difference between this threat-based persuasion and fear-based advertising is that the ads are just bullshitting you into believing you're in some danger, so you'll buy the advertiser's "solution", while threat-based approach is that the other party will put you in danger unless you comply with them.