Yes, God often works in behalf of His purposes and people in particular (in your example Abraham and Sarah). With Christ, He stopped people from pushing him off a cliff (Luke 4) and stoning Him (John 10 - that we have been talking about).
Nevertheless, He does not restrain a lot of sin - even the most grevious sin.
Jeremiah 32:35 And they built the high places of Baal which are in the Valley of the Son of Hinnom, to cause their sons and their daughters to pass through the fire to Molech, which I did not command them, nor did it come into My mind that they should do this abomination, to cause Judah to sin.’