On a side note, if the ADC and support roam mid after losing their tower, there's nothing stopping the midlaner from roaming bot and collecting the free CS.
You have a valid point, but you're not explaining it well cause you're mad.
ADC should freeze wave outside of tier 2 tower and farm. Support should ward jungle and roam to help protect mid or bot if necessary. If enemy team is seiging mid, ADC should hard push bot wave, watch map, and either rotate mid or continue to push depending on what is happening on the map. Jungle should also try to stay in bot jungle or around mid lane as much as possible to help protect these weaker lanes from ganks.
In 90% of my games though, this doesn't happen. The ADC continues to play as if their outer tower is still there, not warding or anything and getting constantly caught. Or the support sits bot with the ADC despite constant "go mid lulu" in chat. Or the jungler decides this is the perfect opportunity to steal the enemy blue buff while the enemy ADC, support, mid, and jungle come bot to kill the ADC and use the wave to take the tower. Or the top laner doesn't even think to TP after seeing the enemy support, mid, and jungle in mid lane while the enemy ADC is trying to solo tower dive our behind ADC and instead just plays as if we aren't losing now bot inner and mid outer. And mid is constantly complaining, "there's 18 people in my lane, someone come help me" with the immediate "DON'T TAKE MY CS" afterwards.
Your option is to either tell your teammates this in chat, or let them do their thing and play around it. Tell bot to freeze lane. Explain that a freeze means you need 4 more enemy minions than ally minions. Explain that you'll ping or something when you need help and that the ADC should otherwise to farm.
If they don't want to do that, then you can rotate bot and do that instead. Yeah, your wave clear is wasted when you're freezing a lane, but you'll be further ahead and maybe be able to make up for your bot lane not following some simple instructions. Or, since you can clear waves fast, just keep pushing the wave into the enemy tower and rotate mid while it slow pushes back. This'll force the enemy team to either send someone to respond to it or lose more CS/XP, which benefits your team.
The "MY TEAM SUCKS" excuse only works so far when you don't do anything to try and overcome their issues. Yeah, you can't stop them from trying to 1v5 in the enemy jungle. But something this simple is something you can fix easily yourself even with dumb teammates.