why was Jesus obsessed with forgiving sins?

dear forum

we have Christian friends here that seem so proud of their sinfulness

they proudly publically boast they are murderers, thieves, adulterers, liars & other forms of low life

if that is the case, why did Jesus wish to forgive people of sin?

does forgiving sin created a better world or a worse world?

if Christians do not take pride in being good & harmless (sinless) people then what is the point of Christianity?

does Christianity reward bad people & therefore turn upside natural & normal human values?