Which is why we need the 20 min rule..
(And perhaps two types of RC)
This is something for which I have advocated for a long time...
Law 9 needs to be divided into sections that reflect three different types of foul play... Cynical; Careless/Reckless; Intentionally Dangerous.
for acts of foul play that are Cynical
... intentional technical infringements such as deliberate knock-ons, repeated offsides on defence etc... player comes back on after 10 minutes
for acts of foul play that are Careless or Reckless cause or are likely to cause injury to an opponent (late and early tackles, tackles without the ball etc)... player is dismissed for the rest of the match, but can be replaced after 20 minutes.
for acts of foul play that are Intentionally Dangerous such as punching, stamping, eye-gouging, bag-snatching, biting etc (i.e. what sendings-off used to be for).... player is dismissed for the rest of the match and is not replaced.