Matthew 7.7-12 God Says to Ask but How Can We Ask if Calvinism is True?

[Mat 7:7-12 KJV] "7 Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you: 8 For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened. 9 Or what man is there of you, whom if his son ask bread, will he give him a stone? 10 Or if he ask a fish, will he give him a serpent? 11 If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask him? 12 Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets."

What's the point of asking for salvation if you are irresistibly selected anyway?

Would God give you a stone (preterition) if a son asks for bread of life?

How can a Calvinist ever say you can't respond to God's command to believe in Him when verse 11 says even being evil, you know how to give good gifts to your children? If you can do this surely you can accept the gospel of salvation freely.

If it is wrong for us not to help others, how is it wrong for God in reaching out to us with prevenient grace?