people think jesus was there to change the law, overthrow the priests and enforce his new laws. That is not at all true. Jesus simply was telling people " Hey look, I am not here to overthrow anyone or change the official law.
Ohhh! I think I see where there's a miscommunication. You called it 'the official law', seemingly referring to laws made by humans. But in the Bible passages quoted earlier, it's referred to as 'the Law', as in, 'God's Law', as in, 'the Commandments' that this god supposedly gave to Moses and whoever it was who took up the job after Moses.
So when Jesus supposedly says 'I'm not here to challenge the Law' (paraphrased, not quoted, hence no " quotation marks; see how that works, guys?), he wasn't saying 'I'm not here to cause trouble with the human authorities', he was supposedly saying 'I'm not here to say that God's Laws have changed. His Laws are unchanged. You still have to follow them. I'm saying something in addition to those Laws.'
This is why fundies are obsessed with the 10 Commandments. (BTW, there are many many more Commandments than just the famous 10 (which themselves are actually more than 10); I seem to recall there are something in the neighbourhood of 600 or so total; various people dispute which ones are 'the ones we must follow' vs. 'the ones we can ignore', but of 'the ones actually claimed to be given from god', I'm pretty sure it's around 600.)