Depending upon your age, that’s not too surprising. When I was about 25 I kind of felt the same way. I’m now 50+ My mom is little over 20 years older than I am. I’d say she understands me pretty well and I understand her.
The older you get the more wisdom you get and you start to understand the other side just a little more
Not sure what “fptp” means
But a legislator can vote how ever they want. There is no law that stops them but as another mentioned, if they don’t vote the party line then they can expect the party funds their opponent.