There are several reasons to guarantee the person responsible for repayment to the guarantor:

Don't ask the purpose of the loan when guaranteeing.

It is impossible to accurately predict the production and operation prospects and repayment ability of the guarantor when guaranteeing.

I didn't know the creditworthiness of the guaranteed person when I guaranteed it.

When you guarantee, you don't love face. If you don't, you will suffer.

Charge when guaranteeing (accepting gifts).

I haven't fully understood the relevant provisions of the national contract law and guarantee law.

I haven't read the guarantee contract in detail, and I don't know much about the guarantee responsibility of joint and several liability guarantee and general guarantee.