Firstly, it is quite convenient ant safe for us to use a credit card. Cash-stolen does not exist in this way. People now take a card instead of a heavy purse wherever they go. Secondly, credit cards represent great honour. People using credit cards shows his special identity and draw others attention.
On the other hand, credit cards are not always that good. Credit cards can lead to overspending somehow. People pay more than they have and then get busy paying off. Furthermore the credit card cheating happens more often.
In my opinion, credit cards do good in our life. But we should use them carefully. Only when used credit cards properly can make contribution to a more convenient and safer life.