Close "or" open, no "and"+"vice versa"

What's wrong with a cat who come to your lawn for a food?

Just give it a food then he/she will walk away.

If by any chances they come again,maybe they thought you're good,nice and friendly.

If they didnt come,just remember those cat also have their own life.Their own playground to play.Their own friend to meet.Their own place to go.Their own dream to pursuit.Their own promise to keep.

Same goes to you.

What happen if you close the gate,and they just come by to say hi?

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Close the gate before any cat come.By any mean,never open the gate.

or 

Open it to welcome any cat and continue accepting them.