It’s totally selfish and uncaring of others comfort who have equally paid for their seat on an airline (or a bus) that are subject to being discomforted by the self absorbed people that recline into the space of those behind them - I do however blame the companies though for the lousy seat...
There are seat designs available that recline by way of the base of the seat moving forwards opposed to the top of the seat rotating on a pivot backwards - eg the Rocky mountaineer trains in Canada. By moving the seat forwards the space lost is legroom but only for the person wishing to recline...