Why should i pay for something?

Because you have a deductible. That's how it works. Go after the other person in small court if it was their fault. But your insurance company is doing their end of the bargain.

That's why you need to maintain a savings account because things happen and life isn't fair.

Because your collision coverage is going to cover your damages and it has a $500 deductible, you will have to pay it.  If your insurance company has the other person's information, I can assure you,  they will go after him including taking him to court to recover what they paid out to fix your car, you can take him to small claims court to recover the $500 deductible you had to pay out of pocket plus any other expenses you incurred relating to this matter, and if applicable, any time you lost from your job to take care of this.   

When you bought the insurance you agreed to the deductible. You should have asked then what that meant. Be lucky the deductible wasn't a thousand.

if you read the policy you pay the first $600 and they pay the rest , or your policy would be higher thats why , read the paperwork .

Ignore the advice to go to a zero deductible. It is usually very expensive , often adding $200 to the premium. Paying $200 for $500 is not sensible.

Better idea is to pay for legal insurance which most insurers offer as an extra. It’s normally about $50 and you get a free lawyer to pursue uninsured loses. Your insurance company is supposed to do this in theory but they don’t care so don’t really try very hard.

Why?  Because you chose that $500. deductible when you bought your insurance.  BUT.....You may get it back.  Your insurance company will pay to repair your car minus the $500. Then they will go after the bad guy (sue him) and if they win they will return your $500.

You better get a 3 minute "Insurance 101" lesson so you know how insurance works.

You have to pay because you agreed to a $500 deductible when you signed up for the policy.  It doesn't matter whose fault it is.

It's not your fault when a hail storm damages your vehicle either, but there's a deductible for that too.  Welcome to the real world.

You pay whatever the deductible amount is on YOUR insurance policy. I carry $250 deductible.  My husband carries $1,000 deductible.  It depends on YOUR individual policy.  You didn't carry uninsured/underinsured coverage?  That would have paid the total amount.  Did your insurance company advise you to sue in Small Claims Court for your deductible and any other expenses?  The person who hit you is, of course, responsible.  I'm quite surprised that your insurance company is willing to pay for repairs to a 2006 Jetta with a serious oil leak - "I have a 2006 jetta that has an oil leak so i went to a mechanic shop and they estimated the price up to 1000$"  Blue Book value is in the area of $3,000.

Because you have a $500 deductible policy.

Because the policy you got HAS a $500 deductible.

Now, you have the legal right to sue the at fault driver for that $500 and you would very likely win such a suit. But, that would take time, and then you have to collect the money after such a court win.

A smart person keeps such a sum banked in case they have need of it.