Because

Deuteronomy 29:25-28
And the people will answer, 'It is because they abandoned the covenant of the LORD, the God of their fathers, which He made with them when He brought them out of the land of Egypt. . . .

2 Chronicles 7:22
And others will answer, 'Because they have forsaken the LORD, the God of their fathers, who brought them out of Egypt, and have embraced other gods, worshiping and serving them. Because of this, He has brought all this disaster upon them.'"

Jeremiah 2:10-13, 19
Cross over to Cyprus and take a look; send to Kedar and consider carefully; see if there has ever been anything like this: . . .

Jeremiah 5:19
And when the people ask, 'For what offense has the LORD our God done all these things to us?' You are to tell them, 'Just as you have forsaken Me and served foreign gods in your land, so will you serve foreigners in a land that is not your own.'

Jeremiah 16:10-13
When you tell these people all these things, they will ask you, 'Why has the LORD pronounced all this great disaster against us? What is our guilt? What is the sin that we have committed against the LORD our God?' . . .

Jeremiah 50:7
All who found them devoured them, and their enemies said, 'We are not guilty, for they have sinned against the LORD, the habitation of righteousness, the LORD, the hope of their fathers.'

Lamentations 2:16, 17
All your enemies open their mouths against you. They hiss and gnash their teeth, saying, "We have swallowed her up. This is the day for which we have waited. We have lived to see it!" . . .

Lamentations 4:13-15
But this was for the sins of her prophets and the guilt of her priests, who shed the blood of the righteous in her midst. . . .

Ezekiel 36:17-20
"Son of man, when the people of Israel lived in their land, they defiled it by their own ways and deeds. Their behavior before Me was like the uncleanness of a woman in her monthly impurity. . . .

Zephaniah 1:4, 5
"I will stretch out My hand against Judah and against all who dwell in Jerusalem. I will cut off from this place every remnant of Baal, the names of the idolatrous and pagan priests-- . . .

therefore

Jeremiah 12:7, 8
I have forsaken My house; I have abandoned My inheritance. I have given the love of My life into the hands of her enemies. . . .