They should be helped in every way to do their job. The first umpires I knew were my schoolmasters - their authority was earned and unquestioned. We were immensely competitive, but decisions were accepted in good faith because there was no other possible arbiter. Now there is. And dissenting opinions are easier to voice.
Intense competitiveness is nothing new.
The game in Sri Lanka will always have what we call 'chillies'. England must understand that they don't have the monopoly on lions on the chest. At the time of my and Sri Lanka's first Test, against England, in 1981 I thought umpires were the master of all that they saw. Visual aids were not even in the reckoning. If we are completely honest, we players do occasionally resent this intrusion into our workplace.