It's sad that you have to form your polemics in the form of a strawman argument. Nobody here would say they threaten anyone with hell, but they DO warn people just as the bible says to do
Eze 3:18 When I say to the wicked, You shall surely die; and you do not give him warning, nor speak to warn the wicked from his wicked way, to save his life; the same wicked one shall die in his iniquity; but I will require his blood at your hand.
Eze 3:19 Yet if you warn the wicked, and he does not turn from his wickedness nor from his wicked way, he shall die in his iniquity; but you have delivered your soul.
Eze 3:20 And when the righteous turns from his righteousness and commits iniquity, and when I lay a stumbling block before him, he shall die. Because you have not given him warning, he shall die in his sin, and his righteousness which he has done shall not be remembered; but his blood I will require at your hand.
Eze 3:21 But if you warn the righteous so that the righteous does not sin, and if he does not sin, he shall surely live because he is warned; also you have delivered your soul.
Words of Jesus
Luk 12:5 But I will warn you of whom you shall fear:
Fear Him who, after He has killed, has authority to cast into hell. Yea, I say to you, fear Him.